主页My WebLink关于11-19-2018 WRC Public Drinking Water - L. CameronThank you to Dr. John Snow Over 1400 cases, 82 deaths Salmonella Typhi contaminated Six Mile Creek One of the 10 deadliest outbreaks in U.S. history Bacteria Viruses Protozoa Cattle near a shallow water well Heavy rains Then contamination with Camploybacter Colorless, odorless, tasteless Naturally occurring Known human carcinogen Increases risk of cardiovascular disease, diabetes,… MCL = 10 mg/L (lowered from 50 mg/L in 2006) Surface water contains organic matter that reacts with disinfectants such as chlorine Produces TTHMs and HAA5 – ◦Potential carcinogens ◦May cause reproductive or developmental effects Concentrations generally increase the longer the water stays in water pipes Regulations have recently become stricter Lead ◦Found in lead pipes and the solder used in pipes before 1986 ◦In children, causes delays in physical and mental development ◦MCL = 15 ug/L = 15 ppb in water supplies Nitrate ◦Presence associated with agricultural ◦Monitored and not a public water concern ◦May be present in individual wells ◦MCL = 10 mg/L or 10 ppm Public Water System: ◦A system which provides piped water to the public for human consumption, if such system has at least five service connections or regularly serves an average of at least 25 individuals daily at least 60 days out of the year. Municipal Water And, if not on municipal water: ◦Mobile Home Parks ◦Schools ◦Factories ◦Restaurants ◦Hotels and Motels ◦Campgrounds ◦Convenience Stores About 150 public water supplies in Tompkins Community Water System Non-Community Water System ◦Transient Non-Community Water System ◦Non-Transient Non-Community Water System Monthly Operation Reports Sampling E Coli MCL violation Nitrate/Nitrate MCL violation Acute Chlorine Dioxide Maximum Residual Disinfection Level (MRDL) violation Certain Turbidity Level violations Hazardous or toxic chemical contamination Inadequate disinfection Other violation (e.g. –unapproved source) Tier 1: within 24 hours of a public health hazard Tier 2: within 30 days for a violation with the potential to have serious adverse effects after long-term exposure (this includes most MCL violations that are not public health hazards) Tier 3: within one year for less serious violations (includes most monitoring violations) Description of the Violation Any potential adverse health effects The population at risk Whether alternative water supplies should be used What actions consumers should take What is being done to correct the violation How long it will last UCMR 1 UCMR 2 UCMR3 2,4-Dinitrotoluene 1,2-Diphenylbrazine 1,2,3-trichloropropane 2,6-Dinitrotoluene Diazinon Methyl bromide Acetochlor Disulfoton Methyl chloride DCPA mono-acid degradable Fonofos HALON 1011 DCPA di-acid degradable Nitrobenzine HCFC-22 4,4'-DDE Prometon 1,3-butadiene EPTC Terbutos 1,1-dichloroethane Nitrobenzene 2-Methylphenol 1,4-dioxane Perchlorate 2,4-Dinitrophenol Vanadium Terbacil 2,4,6-Tricholorphenol Molybdenum Diuron Cobalt Linuron Strontium Chromium1 Chrominum6 Chlorate PFOS PFOA PFBS PFHxS PFHpA PFNA Wash your hands!