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Q-2, r. 40 - Regulation respecting the quality of drinking water

Schedule
Disposition versions

Full text
SCHEDULE 1
(s. 3)
STANDARDS OF QUALITY OF DRINKING WATER
1. Microbiological parameters
(a) water collected for microbiological analysis purposes must be free from pathogenic microorganisms and indicator microorganisms of fecal contamination, such as Escherichia coli bacteria, enterococci bacteria and F-specific coliphage viruses;
(b) water must not contain more than 10 total coliforms per 100 mL of water collected where a technique is used to count them;
(c) where, pursuant to section 11 of this Regulation, 21 water samples or more are collected over a period of 30 consecutive days, at least 90% of the samples must be free from total coliform bacteria;
(d) where, pursuant to section 11 of this Regulation, less than 21 water samples are collected over a period of 30 consecutive days, only one of the samples may contain total coliform bacteria;
(e) water must not contain more than 200 atypical colonies per membrane where the membrane filtration technique is used to count total coliform bacteria;
(f) water must not contain bacteria in such quantity that they may not be identified or counted where the membrane filtration technique is used to count total coliform bacteria and Escherichia coli bacteria in 100 mL of water collected.
2. Parameters respecting inorganic substances
Water must not contain inorganic substances in a concentration greater than those indicated in the following table:
Inorganic substancesMaximum concentration
(mg/L)
Antimony0.006
Arsenic0.010
Barium1.0
Boron5.0
Bromates0.010
Cadmium0.005
Chloramines(1)3.0
Chlorates0.8
Chlorites0.8
Chromium0.050
Copper1.0
Cyanides0.20
Fluorides1.50
Lead0.005
Mercury0.001
Nitrates + nitrites (expressed as N)10.0
Nitrites (expressed as N)1.0
Selenium0.010
Uranium0.020
3. Parameters respecting organic substances
Water must not contain organic substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Pesticides Maximum concentration
(µg/L)
__________________________________________________________________

Aldicarb and its metabolites 7
__________________________________________________________________

Aldrin and dieldrin 0.7
__________________________________________________________________

Atrazine and its metabolites 3.5
__________________________________________________________________

Azinphos-methyl 17
__________________________________________________________________

Bendiocarb 27
__________________________________________________________________

Bromoxynil 3.5
__________________________________________________________________

Carbaryl 70
__________________________________________________________________

Carbofuran 70
__________________________________________________________________

(4-chloro-2-methylphenoxy) acetic
acid also referred to as MCPA 30
__________________________________________________________________

Chlorpyrifos 70
__________________________________________________________________

Cyanazine 9
__________________________________________________________________

Diazinon 14
__________________________________________________________________

Dicamba 85
__________________________________________________________________

Diclofop-methyl 7
__________________________________________________________________

2,4-dichlorophenoxyacetic acid
also referred to as 2,4-D 70
__________________________________________________________________

Dimethoate 14
__________________________________________________________________

Dinoseb 7
__________________________________________________________________

Diquat 50
__________________________________________________________________

Diuron 110
__________________________________________________________________

Glyphosate 210
__________________________________________________________________

Malathion 140
__________________________________________________________________

Methoxychlor 700
__________________________________________________________________

Metolachlor 35
__________________________________________________________________

Metribuzin 60
__________________________________________________________________

Paraquat (in dichlorides) 7
__________________________________________________________________

Parathion 35
__________________________________________________________________

Phorate 1.4
__________________________________________________________________

Picloram 140
__________________________________________________________________

Simazine 9
__________________________________________________________________

Terbufos 0.5
__________________________________________________________________

Trifluralin 35
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum concentration
(µg/L)
__________________________________________________________________

Benzene 0.5
__________________________________________________________________

Benzo(a)pyrene 0.01
__________________________________________________________________

Carbon tetrachloride 5
__________________________________________________________________

1,2-dichlorobenzene 150
__________________________________________________________________

1,4-dichlorobenzene 5
__________________________________________________________________

1,2-dichloroethane 5
__________________________________________________________________

1,1-dichloroethylene 10
__________________________________________________________________

Dichloromethane 50
__________________________________________________________________

2,4-Dichlorophenol 700
__________________________________________________________________

Microcystins (expessed as
microcystin-LR toxic equivalents)(2) 1.5
__________________________________________________________________

Monochlorobenzene 60
__________________________________________________________________

Nitrilotriacetic acid (NTA) 280
__________________________________________________________________

Pentachlorophenol 42
__________________________________________________________________

Tetrachloroethylene 25
__________________________________________________________________

2,3,4,6-tetrachlorophenol 70
__________________________________________________________________

Trichloroethylene 5
__________________________________________________________________

2,4,6-trichlorophenol 5
__________________________________________________________________

Vinyl chloride 2
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum average
concentration calculated over
4 quarters (µg/L)
__________________________________________________________________

Haloacetic acids (monochloroacetic acid,
dichloroacetic acid, trichloroacetic acid,
monobromoacetic acid and dibromoacetic acid)(3) 60
__________________________________________________________________

Total trihalomethanes
(chloroform, bromodichloromethane,
chlorodibromomethane
and bromoform)(3) 80
__________________________________________________________________
4. Parameters respecting radioactive substances
Water must not contain radioactive substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Radioactive substances Maximum concentration
(Bq/L)
__________________________________________________________________

Cesium-137 10
__________________________________________________________________

Iodine-131 6
__________________________________________________________________

Lead-210 0.2
__________________________________________________________________

Radium-226 0.5
__________________________________________________________________

Strontium-90 5
__________________________________________________________________

Tritium 7,000
__________________________________________________________________
5. Parameters respecting turbidity
The turbidity of water must be less than or equal to 5.0 NTU (nephelometric turbidity units).
5.1. Treatment facilities covered by the third paragraph of section 22

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(4)(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements(4)

Membrane filtration 0.1 in 95% of 0.2
measurements(4)

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
5.2. Treatment facilities covered by paragraph 3 of section 22.1

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements

Membrane filtration 0.2 in 95% of 0.3
measurements

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
(1) For the purposes of this Schedule, chloramine concentration is the difference between the measurements of total residual chlorine and free residual chlorine.
(2) The concentrations of microcystin-LA, microcystin-RR, microcystin-YR and microcystin-YM must be converted using the equivalence factors below and then be added to the microcystin-LR concentrations:
___________________________________________________________________

Variant microcystins Equivalence factor
___________________________________________________________________

Microcystine-LA 1.0
___________________________________________________________________
Microcystine-RR 0.1
___________________________________________________________________
Microcystine-YR 1.0
___________________________________________________________________
Microcystine-YM 1.0
___________________________________________________________________
(3) For the purpose of calculating the concentration of total trihalomethanes and haloacetic acids, the person in charge must identify the maximum concentration obtained during the quarter and calculate the average of the maximum values obtained for 4 consecutive quarters.
(4) That limit value may be exceeded in 5% of measurements, but without exceeding 12 consecutive hours; the result may at no time exceed the limit value provided for in Column 3 of the table.
(5) That limit value may be increased to 0.5 NTU in 95% of measurements if the percentage of elimination of pathogenic micro-organisms provided for in section 5 or 5.1 is fully ensured by the disinfection treatment downstream of the filtration; the result must at no time exceed the value of 5.0 NTU.
(6) That average is calculated by means of data collected at each filter.
O.C. 647-2001, Sch. 1; O.C. 467-2005, s. 50; O.C. 70-2012, s. 71; O.C. 163-2021, s. 7.
SCHEDULE 1
(s. 3)
STANDARDS OF QUALITY OF DRINKING WATER
1. Microbiological parameters
(a) water collected for microbiological analysis purposes must be free from pathogenic microorganisms and indicator microorganisms of fecal contamination, such as Escherichia coli bacteria, enterococci bacteria and F-specific coliphage viruses;
(b) water must not contain more than 10 total coliforms per 100 mL of water collected where a technique is used to count them;
(c) where, pursuant to section 11 of this Regulation, 21 water samples or more are collected over a period of 30 consecutive days, at least 90% of the samples must be free from total coliform bacteria;
(d) where, pursuant to section 11 of this Regulation, less than 21 water samples are collected over a period of 30 consecutive days, only one of the samples may contain total coliform bacteria;
(e) water must not contain more than 200 atypical colonies per membrane where the membrane filtration technique is used to count total coliform bacteria;
(f) water must not contain bacteria in such quantity that they may not be identified or counted where the membrane filtration technique is used to count total coliform bacteria and Escherichia coli bacteria in 100 mL of water collected.
2. Parameters respecting inorganic substances
Water must not contain inorganic substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Inorganic substances Maximum concentration
(mg/L)
__________________________________________________________________

Antimony 0.006
__________________________________________________________________

Arsenic (As) 0.010
__________________________________________________________________

Barium (Ba) 1.0
__________________________________________________________________

Boron (B) 5.0
__________________________________________________________________

Bromates 0.010
__________________________________________________________________

Cadmium (Cd) 0.005
__________________________________________________________________

Chloramines(1) 3
__________________________________________________________________

Chlorates 0.8
__________________________________________________________________

Chlorites 0.8
__________________________________________________________________

Chromium (Cr) 0.050
__________________________________________________________________

Copper (Cu) 1.0
__________________________________________________________________

Cyanides (CN) 0.20
__________________________________________________________________

Fluorides (F) 1.50
__________________________________________________________________

Lead (Pb) 0.010
__________________________________________________________________

Mercury (Hg) 0.001
__________________________________________________________________

Nitrates + nitrites 10.0
(expressed as N)
__________________________________________________________________

Nitrites (expressed as N) 1.0
__________________________________________________________________

Selenium (Se) 0.010
__________________________________________________________________

Uranium (U) 0.020
__________________________________________________________________
3. Parameters respecting organic substances
Water must not contain organic substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Pesticides Maximum concentration
(µg/L)
__________________________________________________________________

Aldicarb and its metabolites 7
__________________________________________________________________

Aldrin and dieldrin 0.7
__________________________________________________________________

Atrazine and its metabolites 3.5
__________________________________________________________________

Azinphos-methyl 17
__________________________________________________________________

Bendiocarb 27
__________________________________________________________________

Bromoxynil 3.5
__________________________________________________________________

Carbaryl 70
__________________________________________________________________

Carbofuran 70
__________________________________________________________________

(4-chloro-2-methylphenoxy) acetic
acid also referred to as MCPA 30
__________________________________________________________________

Chlorpyrifos 70
__________________________________________________________________

Cyanazine 9
__________________________________________________________________

Diazinon 14
__________________________________________________________________

Dicamba 85
__________________________________________________________________

Diclofop-methyl 7
__________________________________________________________________

2,4-dichlorophenoxyacetic acid
also referred to as 2,4-D 70
__________________________________________________________________

Dimethoate 14
__________________________________________________________________

Dinoseb 7
__________________________________________________________________

Diquat 50
__________________________________________________________________

Diuron 110
__________________________________________________________________

Glyphosate 210
__________________________________________________________________

Malathion 140
__________________________________________________________________

Methoxychlor 700
__________________________________________________________________

Metolachlor 35
__________________________________________________________________

Metribuzin 60
__________________________________________________________________

Paraquat (in dichlorides) 7
__________________________________________________________________

Parathion 35
__________________________________________________________________

Phorate 1.4
__________________________________________________________________

Picloram 140
__________________________________________________________________

Simazine 9
__________________________________________________________________

Terbufos 0.5
__________________________________________________________________

Trifluralin 35
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum concentration
(µg/L)
__________________________________________________________________

Benzene 0.5
__________________________________________________________________

Benzo(a)pyrene 0.01
__________________________________________________________________

Carbon tetrachloride 5
__________________________________________________________________

1,2-dichlorobenzene 150
__________________________________________________________________

1,4-dichlorobenzene 5
__________________________________________________________________

1,2-dichloroethane 5
__________________________________________________________________

1,1-dichloroethylene 10
__________________________________________________________________

Dichloromethane 50
__________________________________________________________________

2,4-Dichlorophenol 700
__________________________________________________________________

Microcystins (expessed as
microcystin-LR toxic equivalents)(2) 1.5
__________________________________________________________________

Monochlorobenzene 60
__________________________________________________________________

Nitrilotriacetic acid (NTA) 280
__________________________________________________________________

Pentachlorophenol 42
__________________________________________________________________

Tetrachloroethylene 25
__________________________________________________________________

2,3,4,6-tetrachlorophenol 70
__________________________________________________________________

Trichloroethylene 5
__________________________________________________________________

2,4,6-trichlorophenol 5
__________________________________________________________________

Vinyl chloride 2
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum average
concentration calculated over
4 quarters (µg/L)
__________________________________________________________________

Haloacetic acids (monochloroacetic acid,
dichloroacetic acid, trichloroacetic acid,
monobromoacetic acid and dibromoacetic acid)(3) 60
__________________________________________________________________

Total trihalomethanes
(chloroform, bromodichloromethane,
chlorodibromomethane
and bromoform)(3) 80
__________________________________________________________________
4. Parameters respecting radioactive substances
Water must not contain radioactive substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Radioactive substances Maximum concentration
(Bq/L)
__________________________________________________________________

Cesium-137 10
__________________________________________________________________

Iodine-131 6
__________________________________________________________________

Lead-210 0.2
__________________________________________________________________

Radium-226 0.5
__________________________________________________________________

Strontium-90 5
__________________________________________________________________

Tritium 7,000
__________________________________________________________________
5. Parameters respecting turbidity
The turbidity of water must be less than or equal to 5 NTU (nephelometric turbidity units).
5.1. Treatment facilities covered by the third paragraph of section 22

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(4)(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements(4)

Membrane filtration 0.1 in 95% of 0.2
measurements(4)

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
5.2. Treatment facilities covered by paragraph 3 of section 22.1

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements

Membrane filtration 0.2 in 95% of 0.3
measurements

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
(1) For the purposes of this Schedule, chloramine concentration is the difference between the measurements of total residual chlorine and free residual chlorine.
(2) The concentrations of microcystin-LA, microcystin-RR, microcystin-YR and microcystin-YM must be converted using the equivalence factors below and then be added to the microcystin-LR concentrations:
___________________________________________________________________

Variant microcystins Equivalence factor
___________________________________________________________________

Microcystine-LA 1.0
___________________________________________________________________
Microcystine-RR 0.1
___________________________________________________________________
Microcystine-YR 1.0
___________________________________________________________________
Microcystine-YM 1.0
___________________________________________________________________
(3) For the purpose of calculating the concentration of total trihalomethanes and haloacetic acids, the person in charge must identify the maximum concentration obtained during the quarter and calculate the average of the maximum values obtained for 4 consecutive quarters.
(4) That limit value may be exceeded in 5% of measurements, but without exceeding 12 consecutive hours; the result may at no time exceed the limit value provided for in Column 3 of the table.
(5) That limit value may be increased to 0.5 NTU in 95% of measurements if the percentage of elimination of pathogenic micro-organisms provided for in section 5 or 5.1 is fully ensured by the disinfection treatment downstream of the filtration; the result must at no time exceed the value of 5.0 NTU.
(6) That average is calculated by means of data collected at each filter.
O.C. 647-2001, Sch. 1; O.C. 467-2005, s. 50; O.C. 70-2012, s. 71.
SCHEDULE 1
(s. 3)
STANDARDS OF QUALITY OF DRINKING WATER
1. Microbiological parameters
(a) water collected for microbiological analysis purposes must be free from pathogenic microorganisms and indicator microorganisms of fecal contamination, such as Escherichia coli bacteria, enterococci bacteria and F-specific coliphage viruses;
(b) water must not contain more than 10 total coliforms per 100 mL of water collected where a technique is used to count them;
(c) where, pursuant to section 11 of this Regulation, 21 water samples or more are collected over a period of 30 consecutive days, at least 90% of the samples must be free from total coliform bacteria;
(d) where, pursuant to section 11 of this Regulation, less than 21 water samples are collected over a period of 30 consecutive days, only one of the samples may contain total coliform bacteria;
(e) water must not contain more than 200 atypical colonies per membrane where the membrane filtration technique is used to count total coliform bacteria;
(f) water must not contain bacteria in such quantity that they may not be identified or counted where the membrane filtration technique is used to count total coliform bacteria and Escherichia coli bacteria in 100 mL of water collected.
2. Parameters respecting inorganic substances
Water must not contain inorganic substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Inorganic substances Maximum concentration
(mg/L)
__________________________________________________________________

Antimony 0.006
__________________________________________________________________

Arsenic (As) 0.010
__________________________________________________________________

Barium (Ba) 1.0
__________________________________________________________________

Boron (B) 5.0
__________________________________________________________________

Bromates 0.010
__________________________________________________________________

Cadmium (Cd) 0.005
__________________________________________________________________

Chloramines(1) 3
__________________________________________________________________

Chlorates (cf. 2013-03-08) 0.8
__________________________________________________________________

Chlorites (cf. 2013-03-08) 0.8
__________________________________________________________________

Chromium (Cr) 0.050
__________________________________________________________________

Copper (Cu) 1.0
__________________________________________________________________

Cyanides (CN) 0.20
__________________________________________________________________

Fluorides (F) 1.50
__________________________________________________________________

Lead (Pb) 0.010
__________________________________________________________________

Mercury (Hg) 0.001
__________________________________________________________________

Nitrates + nitrites 10.0
(expressed as N)
__________________________________________________________________

Nitrites (expressed as N) 1.0
__________________________________________________________________

Selenium (Se) 0.010
__________________________________________________________________

Uranium (U) 0.020
__________________________________________________________________
3. Parameters respecting organic substances
Water must not contain organic substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Pesticides Maximum concentration
(µg/L)
__________________________________________________________________

Aldicarb and its metabolites 7
__________________________________________________________________

Aldrin and dieldrin 0.7
__________________________________________________________________

Atrazine and its metabolites 3.5
__________________________________________________________________

Azinphos-methyl 17
__________________________________________________________________

Bendiocarb 27
__________________________________________________________________

Bromoxynil 3.5
__________________________________________________________________

Carbaryl 70
__________________________________________________________________

Carbofuran 70
__________________________________________________________________

(4-chloro-2-methylphenoxy) acetic
acid also referred to as MCPA (cf. 2013-03-08) 30
__________________________________________________________________

Chlorpyrifos 70
__________________________________________________________________

Cyanazine 9
__________________________________________________________________

Diazinon 14
__________________________________________________________________

Dicamba 85
__________________________________________________________________

Diclofop-methyl 7
__________________________________________________________________

2,4-dichlorophenoxyacetic acid
also referred to as 2,4-D 70
__________________________________________________________________

Dimethoate 14
__________________________________________________________________

Dinoseb 7
__________________________________________________________________

Diquat 50
__________________________________________________________________

Diuron 110
__________________________________________________________________

Glyphosate 210
__________________________________________________________________

Malathion 140
__________________________________________________________________

Methoxychlor 700
__________________________________________________________________

Metolachlor 35
__________________________________________________________________

Metribuzin 60
__________________________________________________________________

Paraquat (in dichlorides) 7
__________________________________________________________________

Parathion 35
__________________________________________________________________

Phorate 1.4
__________________________________________________________________

Picloram 140
__________________________________________________________________

Simazine 9
__________________________________________________________________

Terbufos 0.5
__________________________________________________________________

Trifluralin 35
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum concentration
(µg/L)
__________________________________________________________________

Benzene 0.5
__________________________________________________________________

Benzo(a)pyrene 0.01
__________________________________________________________________

Carbon tetrachloride 5
__________________________________________________________________

1,2-dichlorobenzene 150
__________________________________________________________________

1,4-dichlorobenzene 5
__________________________________________________________________

1,2-dichloroethane 5
__________________________________________________________________

1,1-dichloroethylene 10
__________________________________________________________________

Dichloromethane 50
__________________________________________________________________

2,4-Dichlorophenol 700
__________________________________________________________________

Microcystins (expessed as
microcystin-LR toxic equivalents)(2)
(cf. 2013-03-08) 1.5
__________________________________________________________________

Monochlorobenzene 60
__________________________________________________________________

Nitrilotriacetic acid (NTA) 280
__________________________________________________________________

Pentachlorophenol 42
__________________________________________________________________

Tetrachloroethylene 25
__________________________________________________________________

2,3,4,6-tetrachlorophenol 70
__________________________________________________________________

Trichloroethylene 5
__________________________________________________________________

2,4,6-trichlorophenol 5
__________________________________________________________________

Vinyl chloride 2
__________________________________________________________________
__________________________________________________________________

Other organic substances Maximum average
concentration calculated over
4 quarters (µg/L)
__________________________________________________________________

Haloacetic acids (monochloroacetic acid,
dichloroacetic acid, trichloroacetic acid,
monobromoacetic acid and dibromoacetic acid)(3)
(cf. 2013-03-08) 60
__________________________________________________________________

Total trihalomethanes
(chloroform, bromodichloromethane,
chlorodibromomethane
and bromoform)(3) 80
__________________________________________________________________
4. Parameters respecting radioactive substances
Water must not contain radioactive substances in a concentration greater than those indicated in the following table:
__________________________________________________________________

Radioactive substances Maximum concentration
(Bq/L)
__________________________________________________________________

Cesium-137 10
__________________________________________________________________

Iodine-131 6
__________________________________________________________________

Lead-210 (cf. 2013-03-08) 0.2
__________________________________________________________________

Radium-226 0.5
__________________________________________________________________

Strontium-90 5
__________________________________________________________________

Tritium 7,000
__________________________________________________________________
5. Parameters respecting turbidity
The turbidity of water must be less than or equal to 5 NTU (nephelometric turbidity units).
5.1. Treatment facilities covered by the third paragraph of section 22

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(4)(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements(4)

Membrane filtration 0.1 in 95% of 0.2
measurements(4)

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
5.2. Treatment facilities covered by paragraph 3 of section 22.1

Column 1 Column 2 Column 3

Process Limit value over Limit Value (NTU)
a period of
30 days (NTU)

Coagulated, filtrated and 0.3 in 95% of 1.0(5)
disinfected water measurements(5)

Slow filtration or with 1.0 in 95% of 3.0
diatomaceous earth measurements

Membrane filtration 0.2 in 95% of 0.3
measurements

Other filtration, or Average of 1.0(6) 5.0
exclusion of filtration
under section 5
(1) For the purposes of this Schedule, chloramine concentration is the difference between the measurements of total residual chlorine and free residual chlorine.
(2)(cf. 2013-03-08) The concentrations of microcystin-LA, microcystin-RR, microcystin-YR and microcystin-YM must be converted using the equivalence factors below and then be added to the microcystin-LR concentrations:
___________________________________________________________________

Variant microcystins Equivalence factor
___________________________________________________________________

Microcystine-LA 1.0
___________________________________________________________________
Microcystine-RR 0.1
___________________________________________________________________
Microcystine-YR 1.0
___________________________________________________________________
Microcystine-YM 1.0
___________________________________________________________________
(3) For the purpose of calculating the concentration of total trihalomethanes and haloacetic acids, the person in charge must identify the maximum concentration obtained during the quarter and calculate the average of the maximum values obtained for 4 consecutive quarters.
(4) That limit value may be exceeded in 5% of measurements, but without exceeding 12 consecutive hours; the result may at no time exceed the limit value provided for in Column 3 of the table.
(5) That limit value may be increased to 0.5 NTU in 95% of measurements if the percentage of elimination of pathogenic micro-organisms provided for in section 5 or 5.1 is fully ensured by the disinfection treatment downstream of the filtration; the result must at no time exceed the value of 5.0 NTU.
(6) That average is calculated by means of data collected at each filter.
O.C. 647-2001, Sch. 1; O.C. 467-2005, s. 50; O.C. 70-2012, s. 71.
© Gouvernement du Québec