Pacheco Trailer Park

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

Monitoring and Reporting: 2 violations, Jan 2025 to Jun 2026. 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: Groundwater Rule (GWR), E. coli (Escherichia coli).

Groundwater Rule (GWR), health effects: Protects against enteric viruses, which can contaminate groundwater via cracked well casings, failing septic systems, or animal waste. Viruses persist longer in groundwater than in surface water. Hepatitis A and norovirus are the primary pathogens of concern. Limit: Treatment technique: 4-log virus treatment required when source water has fecal indicators or significant sanitary deficiencies

E. coli (Escherichia coli), health effects: Most E. coli strains cause diarrheal illness. Some strains (e.g., O157:H7) produce toxins causing severe bloody diarrhea, hemolytic uremic syndrome (HUS — a form of kidney failure), and death — especially in children under 5 and the elderly. Even non-pathogenic strains in drinking water indicate that disease-causing organisms may also be present. Limit: Zero (one confirmed positive sample = acute MCL violation)

Treatment Technique Violation, health-based: 2 violations, Nov 2024 to Jul 2025. The system did not carry out a required treatment process or corrective action.

Contaminant on the record: Stage 1 Disinfectants and DBP Rule.

Stage 1 Disinfectants and DBP Rule, health effects: See TTHMs (2950) and HAA5 (2456) for their specific health effects. Bromate is a probable human carcinogen (Group B2). Chlorite at elevated levels can cause hemolytic anemia, particularly in infants, developing fetuses, and individuals with certain enzyme deficiencies. Violations indicate the system exceeded one or more of these byproduct or disinfectant limits. Limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L; Bromate: 0.010 mg/L; Chlorite: 1.0 mg/L

Monitoring and Reporting: 294 violations, Oct 2024 to Jun 2026. 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: 402 violations, Oct 2024 to Jun 2026. 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.

Maximum Contaminant Level Violation, health-based: 3 violations, Jul 2025 to Mar 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Monitoring and Reporting: 11 violations, Oct 2024 to Jun 2026. 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.

Health effects: Long-term arsenic exposure increases risk of bladder, lung, and skin cancers. It is also associated with cardiovascular disease, type 2 diabetes, and developmental effects in children. Arsenic is classified as a Group A human carcinogen by the EPA. Limit: 0.010 mg/L (10 ppb), set in 2001 and enforceable since 2006; the previous MCL was 0.050 mg/L (50 ppb)

Monitoring and Reporting: 136 violations, Oct 2024 to Jun 2026. 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, Fluoride, Mercury, Nickel, Selenium, Antimony, Beryllium, Thallium.

Monitoring and Reporting: 12 violations, Jan 2024 to Jun 2026. 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: Nitrate, Nitrite.

Monitoring and Reporting: 42 violations, Oct 2024 to Jun 2026. 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: Gross Alpha, Excl. Radon and U, Combined Uranium, Combined Radium (-226 and -228).

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

Reporting Violation: 1 violation, Jul 2025 to Oct 2025. The system did not report required information on time.

What the rule requires: The 2021 LCRR updated the 1991 LCR with mandatory lead service line inventories and replacement planning, a new 'trigger level' at 10 ppb requiring optimization, and strengthened public education. The 2024 Lead and Copper Rule Improvements (LCRI) further requires replacing all lead service lines within 10 years.

Health effects: Same as Lead and Copper Rule (5000). Violations typically reflect failure to complete the required lead service line inventory or submit a required replacement plan. Lead service lines are the primary source of lead at the tap in many older systems. Limit: Lead action level: 15 ppb (trigger level: 10 ppb); copper action level: 1.3 mg/L

Other Violation: 11 violations, Dec 2024 to Jul 2026. A requirement other than monitoring, reporting, or a contaminant limit, such as public notice or the annual water quality report.

Contaminant on the record: Public Notification Rule.