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Treatment Technique Violation, health-based: 1 violation, Jul 2025 to Sep 2025. The system did not carry out a required treatment process or corrective action.

What the rule requires: The 2013 RTCR (effective 2016) replaced the original TCR. It triggers automatic E. coli testing whenever total coliform is found. A single E. coli-positive sample is an acute MCL violation. It also requires systems exceeding 5% total coliform-positive samples to conduct a formal assessment and correct any deficiencies, helping prevent contamination before it escalates.

Health effects: Total coliform bacteria indicate that the disinfection barrier has been breached or fecal contamination is entering the system. E. coli specifically indicates fecal contamination and the possible presence of disease-causing pathogens (norovirus, Salmonella, Shigella, Campylobacter). Illness can be severe in elderly, young children, and immunocompromised individuals. Limit: Zero E. coli; ≤5% of monthly samples total coliform-positive

Monitoring and Reporting: 63 violations, Oct 2024 to Sep 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminants on the record: 1,2,4-Trichlorobenzene, cis-1,2-Dichloroethylene, Xylenes, Total, Dichloromethane (Methylene Chloride), o-Dichlorobenzene, p-Dichlorobenzene, Vinyl Chloride, 1,1-Dichloroethylene, trans-1,2-Dichloroethylene, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon Tetrachloride, 1,2-Dichloropropane, Trichloroethylene (TCE), 1,1,2-Trichloroethane, Tetrachloroethylene (PCE), Chlorobenzene, Benzene, Toluene, Ethylbenzene, Styrene.

Monitoring and Reporting: 87 violations, Oct 2024 to Sep 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminants on the record: Endrin, BHC-Gamma (Lindane), Methoxychlor, Toxaphene, Dalapon, Diquat, Endothall, Glyphosate, Di(2-ethylhexyl) Adipate, Oxamyl (Vydate), Simazine, Di(2-ethylhexyl) Phthalate, Picloram, Dinoseb, Hexachlorocyclopentadiene, Carbofuran, Atrazine, Alachlor (Lasso), Heptachlor, Heptachlor Epoxide, 2,4-D, 2,4,5-TP (Silvex), Hexachlorobenzene, Benzo(a)pyrene, Pentachlorophenol, Polychlorinated Biphenyls (PCBs), 1,2-Dibromo-3-Chloropropane (DBCP), Ethylene Dibromide (EDB), Chlordane.

Monitoring and Reporting: 3 violations, Oct 2024 to Sep 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

What the rule requires: Arsenic is a naturally occurring metalloid found in bedrock and soil. It dissolves into groundwater from natural deposits and can also come from mining, smelting and past pesticide use. EPA lowered the MCL from 50 ppb to 10 ppb in 2001.

Monitoring and Reporting: 36 violations, Oct 2024 to Sep 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminants on the record: Barium, Cadmium, Chromium, Cyanide, Fluoride, Mercury, Nickel, Selenium, Antimony, Beryllium, Thallium, Asbestos.

Maximum Contaminant Level Violation, health-based: 1 violation, Jan 2024 to Mar 2025. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Monitoring and Reporting: 2 violations, Jul 2024 to Sep 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminant on the record: Nitrate-Nitrite (Combined).

Nitrate-Nitrite (Combined), health effects: The combined limit protects against methemoglobinemia — the same risk as nitrate alone and nitrite alone. In infants under 6 months, gut bacteria convert these nitrogen compounds to forms that block oxygen transport in blood ('blue baby syndrome'). Pregnant women and individuals with certain enzyme deficiencies are also at elevated risk. Limit: 10 mg/L as nitrogen (NO₂-N + NO₃-N combined)