Pauma Valley Water Company
Community water system in San Diego County, California, serving 185 people from ground water. 5 rules violated in the past three years, 2 still unresolved. Privately owned.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Currently in violation
EPA data updated Oct 7, 2026
Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Treatment Technique Violation
Health-based
1 violation, Jun 2010 to open · Interim Enhanced Surface Water Treatment Rule
Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Treatment Technique Violation Health-based1 violation, Jun 2010 to open · Interim Enhanced Surface Water Treatment Rule
Treatment Technique Violation, health-based: 1 violation, open since Jun 2010. The system did not carry out a required treatment process or corrective action.
Contaminant on the record: Interim Enhanced Surface Water Treatment Rule.
Interim Enhanced Surface Water Treatment Rule, health effects: Violations indicate failure to meet treatment technique requirements that reduce exposure to Cryptosporidium, Giardia, and other microbial pathogens. Cryptosporidium poses the greatest risk to immunocompromised individuals, infants, and the elderly, and can cause severe or fatal illness in vulnerable populations. Limit: Treatment technique — no numeric MCL; compliance means meeting turbidity limits (0.3 NTU in 95% of monthly samples) and Cryptosporidium removal benchmarks
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment Technique Violation
Health-based
1 violation, Jun 2010 to open
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment Technique Violation Health-based1 violation, Jun 2010 to open
Treatment Technique Violation, health-based: 1 violation, open since Jun 2010. The system did not carry out a required treatment process or corrective action.
What the rule requires: The LT2 ESWTR (2006) required all surface water and GWUDI systems to monitor source water for Cryptosporidium, then apply additional treatment based on measured concentrations. Higher-bin systems (more oocysts detected) must install advanced treatment — UV disinfection, ozone, or membrane filtration — beyond the original SWTR requirements.
Health effects: Cryptosporidium is a chlorine-resistant protozoan parasite that causes cryptosporidiosis — severe watery diarrhea, cramping, nausea, and fever. In immunocompromised individuals (HIV/AIDS, transplant recipients), it can be life-threatening and prolonged. Infants and the elderly are also at elevated risk. LT2 violations indicate failure to complete monitoring or apply the required additional treatment tier. Limit: Treatment technique — additional Cryptosporidium treatment based on bin classification
About this ruleAlso violated in the past three years
Jul to Sep 2023 to Jul to Sep 2026
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation
Health-based
2 violations, Jul 2023 to Jan 2024 · Total Haloacetic Acids (HAA5) · 2 measured values
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation Health-based2 violations, Jul 2023 to Jan 2024 · Total Haloacetic Acids (HAA5) · 2 measured values
Maximum Contaminant Level Violation, health-based: 2 violations, Jul 2023 to Jan 2024. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 60 UG/L · Jul to Sep 2023
Limit 60 UG/L · Jul to Sep 2023
Contaminant on the record: Total Haloacetic Acids (HAA5).
Total Haloacetic Acids (HAA5), health effects: Dichloroacetic acid is a probable human carcinogen (Group B2). Long-term exposure to trichloroacetic acid may also increase cancer risk. Animal studies show liver, kidney, and reproductive effects at high doses. Limit: 0.060 mg/L (60 ppb) locational running annual average (LRAA)
Inorganic Chemicals
Maximum Contaminant Level Violation
Health-based
8 violations, Jul 2023 to Mar 2026 · Selenium · 8 measured values
Inorganic Chemicals
Maximum Contaminant Level Violation Health-based8 violations, Jul 2023 to Mar 2026 · Selenium · 8 measured values
Maximum Contaminant Level Violation, health-based: 8 violations, Jul 2023 to Mar 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 50 UG/L · Jan to Mar 2026
Limit 0.05 UG/L · Oct to Dec 2025
Limit 0.05 UG/L · Jul to Sep 2025
Limit 0.05 MG/L · Jul to Sep 2024
Limit 0.05 MG/L · Apr to Jun 2024
Jan to Mar 2024
2 more in EPA's record
Contaminant on the record: Selenium.
Selenium, health effects: Chronic exposure above the MCL causes selenosis — characterized by hair and nail loss, peripheral neuropathy, fatigue, and gastrointestinal disturbance. Liver damage can occur with prolonged high intake. The margin between nutritional requirement and toxic dose is narrow, making the MCL an important threshold. Limit: 0.05 mg/L (50 ppb)
Nitrate Rule
Maximum Contaminant Level Violation
Health-based
11 violations, Jul 2023 to Mar 2026 · 11 measured values
Nitrate Rule
Maximum Contaminant Level Violation Health-based11 violations, Jul 2023 to Mar 2026 · 11 measured values
Maximum Contaminant Level Violation, health-based: 11 violations, Jul 2023 to Mar 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 10 MG/L · Jan to Mar 2026
Limit 10 MG/L · Oct to Dec 2025
Limit 10 MG/L · Jul to Sep 2025
Limit 10 MG/L · Apr to Jun 2025
Limit 10 MG/L · Jan to Mar 2025
Limit 10 MG/L · Oct to Dec 2024
5 more in EPA's record
What the rule requires: Nitrate (NO₃) is the most common chemical contaminant in US groundwater, entering from fertilizers, septic systems, and animal waste. It is odorless and tasteless — the only way to know if it's present is to test.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk. Limit: 10 mg/L as nitrogen (NO₃-N)
About this ruleLead and copper at the tap
The 90th percentile of the tap samples the system collected in its latest monitoring period, against EPA's action level. Levels vary between homes.
Action level 0.015 mg/L · Jan 2022 to Dec 2024
About this data
Rules violated and the list above come from EPA's SDWIS violation records, one row per violation and contaminant, grouped by the rule each row belongs to. A violation counts when its non-compliance period ended on or after Jul 1, 2023, the start of the thirteen quarters ECHO's three-year figures cover, or is still open; it is unresolved when it was still open at EPA's data refresh on Oct 7, 2026. EPA's rule code 500, "Not Regulated", is left out, as in ECHO's counts. Each rule's violation count is EPA's, and one rule can carry several: a missed monitoring round for a group of contaminants is one violation per contaminant and period. Category names are EPA's violation categories.
ECHO's own summary count of rules violated agrees with this grouping for 98.8% of active systems nationally, and its count of rules being violated for 98.7%; where they differ, the figures here follow the rows listed.
A measured value shown with a rule is the sample result EPA recorded with that violation (SDWIS viol_measure), against the limit EPA recorded on the same row (state_mcl), both in EPA's unit as written; violations without a recorded value, such as missed monitoring, show none. Other measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.
Lead and copper are the newest 90th-percentile results in EPA's SDWA data download (LCR_SAMPLES, codes PB90 and CU90): for each monitoring period a system reports the 90th-percentile value of its tap samples, which EPA compares with its action level of 0.015 mg/L for lead and 1.3 mg/L for copper (40 CFR 141.80). A result is not a measurement of any one tap.
Service area from EPA's Public Water System Service Area Boundaries dataset: State Agency, verification status Not Verified. The system's location is the centre of the service area EPA publishes for the system.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.