Purpose of notice to interested authorities
18. The sole purpose of the provisions of this Regulation that require notice to be given to interested authorities is to provide interested authorities with information relating to compliance with this Regulation. O. Reg. 505/01, s. 18. SCHEDULE 1 INDICATORS OF ADVERSE WATER QUALITY Each of the following is an indicator of adverse water quality: 1. Water that has not been disinfected is directed to users, if disinfection is used or required. (Corrective action: Stop water use or bring water to a rapid, rolling boil for at least one minute. Restore disinfection immediately. The local Medical Officer of Health may give further instructions and may authorize resumption of normal use of the water.) 2. Escherichia coli (E. coli) or fecal coliform is detected in any required sample of water that has been treated or is otherwise ready for human consumption. (Corrective action: Stop water use or bring water to a rapid, rolling boil for at least one minute. Increase the chlorine dose and flush the water distribution system and plumbing to ensure a free chlorine residual of at least 0.2 mg/L at all points in the affected part(s) of the distribution system and plumbing. Resample and analyze. Corrective action should begin immediately. The local Medical Officer of Health may give further instructions and may authorize resumption of normal use of the water.) 3. Total coliforms are detected (but Escherichia coli or other fecal coliforms are not detected) in any required sample of water that has been treated or is otherwise ready for human consumption. (Corrective action: Normal use of the water may continue. Resample at the same site and analyze. If confirmed to be positive, stop water use or bring water to a rapid, rolling boil for at least one minute, increase the chlorine dose and flush the water distribution system and plumbing to ensure a free chlorine residual of at least 0.2 mg/L at all points in the affected part(s) of the distribution system and plumbing, and call the Medical Officer of Health again and consult. Corrective action should begin immediately. The local Medical Officer of Health may give further instructions and may authorize resumption of normal use of the water.) 4. More than 500 colonies per millilitre are detected on a heterotrophic plate count analysis (but Escherichia coli or other fecal coliforms are not detected) in any required sample of water that has been treated or is otherwise ready for human consumption. (Corrective action: Normal use of the water may continue. Resample at the same site and analyze. If confirmed to be positive, stop water use or bring water to a rapid, rolling boil for at least one minute and call the local Medical Officer of Health again and consult. The local Medical Officer of Health may give further instructions and may authorize resumption of normal use of the water.) 5. Sodium concentration exceeds 20 mg/L. The aesthetic objective for sodium in drinking water is 200 mg/L, but the local Medical Officer of Health must be notified when the sodium concentration exceeds 20 mg/L so that this information may be communicated to local physicians for their use with patients on sodium restricted diets. (Corrective action: Normal use of the water may continue. Resample and analyze. On confirmation, call the local Medical Officer of Health again.) 6. A pesticide not listed in Schedule 2 is detected. Drinking water should be free of pesticides and every effort should be made to prevent pesticides from entering raw water sources. Pesticides may be reported by their most common trade name, a listing of which, called the Compendium of Scheduled Pesticides, is accessible on the Internet through the website of the Ontario Pesticides Advisory Committee at www.opac.gov.on.ca or the website of the Ministry of the Environment at www.ene.gov.on.ca. (Corrective action: Normal use of the water may continue. Resample, take a corresponding raw water sample and analyze. On confirmation, call the local Medical Officer of Health again and consult.) 7. If chlorination is used, the concentration of free chlorine residual is less than 0.05 mg/L in any required sample. (Corrective action: Stop water use. Resample and test again. If the free chlorine residual is still less than 0.05 mg/L, increase the chlorine dose and flush the water distribution system and plumbing to ensure the free chlorine residual is at least 0.2 mg/L at all points in the distribution system and plumbing. Resample and test again. If the free chlorine residual is less than 0.05 mg/L, stop water use until otherwise directed by the local Medical Officer of Health. Corrective action should begin immediately.) 8. If filtration is used, the turbidity is more than 1.0 Nephelometric Turbidity Units (NTU) in any required sample. (Corrective action: Normal use of the water may continue. Resample and test again. If the turbidity is still more than 1.0 Nephelometric Turbidity Units (NTU), review the operation of all treatment processes that are installed upstream of filtration to determine the possible impact on filtration and other downstream processes and, (a) backwash the filter in accordance with the manufacturer’s recommendations and flush the water distribution system and plumbing; or (b) replace the filter cartridge or filter element and flush the water distribution system and plumbing.) O. Reg. 505/01, Sched. 1. SCHEDULE 2 CHEMICAL STANDARDS  PARAMETER

MAC   (mg/L)

IMAC   (mg/L)


Alachlor

 

0.005


Aldicarb

0.009

 


Aldrin + Dieldrin

0.0007

 


Arsenic

 

0.025


Atrazine + N-dealkylated metabolites

 

0.005


Azinphos-methyl

0.02

 


Barium

1.0

 


Bendiocarb

0.04

 


Benzene

0.005

 


Boron

 

5.0


Bromoxynil

 

0.005


Cadmium

0.005

 


Carbaryl

0.09

 


Carbofuran

0.09

 


Carbon Tetrachloride

0.005

 


Chlordane (total)

0.007

 


Chlorpyrifos

0.09

 


Chromium

0.05

 


Copper

 

 


Cyanazine

 

0.01


Diazinon

0.02

 


Dicamba

0.12

 


1,2-Dichlorobenzene

0.2

 


1,4-Dichlorobenzene

0.005

 


Dichlorodiphenyltrichloroethane (DDT) + Metabolites

0.03

 


1,2-Dichloroethane

 

0.005


1,1-Dichloroethylene (vinylidene chloride)

0.014

 


Dichloromethane

0.05

 


2-4-Dichlorophenol

0.9

 


2,4-Dichlorophenoxyacetic acid (2,4-D)

 

0.1


Diclofop-methyl

0.009

 


Dimethoate

 

0.02


Dinoseb

0.01

 


Diquat

0.07

 


Diuron

0.15

 


Ethylbenzene

 

 


Fluoride

1.5 a

 


Glyphosate

 

0.28


Heptachlor + Heptachlor Epoxide

0.003

 


Iron

 

 


Lead

0.01

 


Lindane (total)

0.004

 


Malathion

0.19

 


Manganese

 

 


Mercury

0.001

 


Methoxychlor

0.9

 


Metolachlor 

 

0.05


Metribuzin

0.08

 


Monochlorobenzene

0.08

 


Nitrate (as nitrogen)

10.0

 


Nitrite (as nitrogen)

1.0

 


Paraquat

 

0.01


Parathion

0.05

 


Pentachlorophenol

0.06

 


Phorate

 

0.002


Picloram

 

0.19


Polychlorinated Biphenyls (PCBs)

 

0.003


Prometryne

 

0.001


Selenium

0.01

 


Simazine

 

0.01


Sodium

 

 


Temephos

 

0.28


Terbufos

 

0.001


Tetrachloroethylene (perchloroethylene)

0.030

 


2,3,4,6-Tetrachlorophenol

0.10

 


Toluene

 

 


Triallate

0.23

 


Trichloroethylene

0.05

 


2,4,6-Trichlorophenol

0.005

 


2,4,5-Trichlorophenoxyacetic acid (2,4,5-T)

0.28

 


Trifluralin

 

0.045


Trihalomethanes (total)

0.100

 


Uranium

0.10

 


Vinyl Chloride

0.002

 


Xylenes (total) O. Reg. 505/01, Sched. 2. Notes: Short forms: MAC — Maximum Acceptable Concentration IMAC — Interim Maximum Acceptable Concentration mg/L — milligrams per litre MAC and IMAC are health-related standards. Where neither a MAC or IMAC is indicated, the parameter is listed for reasons related to aesthetics. Footnotes: a Where fluoride is added to drinking water, it is recommended that the concentration be adjusted to between 0.5 and 0.8 mg/L, the optimum level for control of tooth decay.