Does Pauma Valley, CA tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 177 violation(s) across the community water systems serving Pauma Valley, of which 123 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Pauma Valley, CA tap water come from?

Pauma Valley is served by 6 active community water system(s). Their primary sources, per EPA records, are: groundwater, surface water.

CA / Pauma Valley

CA · Tap water records

Pauma Valley tap water, in plain English

Here is what the EPA's own data shows about tap water in Pauma Valley. According to EPA SDWIS data retrieved June 2026, Pauma Valley is served by 6 active community water systems, together reported to serve about 2,555 people.

As of June 2026, EPA records show 177 violations across the community water system(s) serving Pauma Valley, going back to the earliest EPA record. 123 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.

6

Community water systems
~2,555

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Rancho Pauma Mutual Wc

899 served · groundwater · PWSID CA3710012

As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Yuima Municipal Water District Ida

769 served · surface water · PWSID CA3700938

Health-based Interim Enhanced Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 2006. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in June 2022. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2003. All have since returned to compliance, per EPA records.

Yuima Municipal Water District

360 served · surface water · PWSID CA3701408

Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in July 2018. The EPA record lists a level of 12 MG/L; the limit (MCL) is 10 MG/L. All have since returned to compliance, per EPA records.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in June 2022. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2003. All have since returned to compliance, per EPA records.

Rancho Estates Mutual Water Co.

200 served · groundwater · PWSID CA3700936

Health-based Nitrate-Nitrite: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times between July 2017 and April 2018. The EPA record lists a level of 11.2 MG/L; the limit (MCL) is 10 MG/L. All have since returned to compliance, per EPA records.
Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times between January 2016 and April 2017. The EPA record lists a level of 15 MG/L; the limit (MCL) is 10 MG/L. All have since returned to compliance, per EPA records.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in September 2017. All have since returned to compliance, per EPA records.
Monitoring Nitrate: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2016. All have since returned to compliance, per EPA records.
Monitoring METHYL TERT-BUTYL ETHER: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2016. All have since returned to compliance, per EPA records.
Monitoring Benzene: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2016. All have since returned to compliance, per EPA records.
Monitoring Gross Alpha Particle Activity: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2016. All have since returned to compliance, per EPA records.
Monitoring Combined Uranium: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2016. All have since returned to compliance, per EPA records.
Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between July 2008 and July 2014. All have since returned to compliance, per EPA records.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between June 2011 and April 2013. All have since returned to compliance, per EPA records.

Pauma Valley Water Company

185 served · groundwater · PWSID CA3700934

Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 62 times between January 2016 and July 2025. The EPA record lists a level of 14.5 MG/L; the limit (MCL) is 10 MG/L. EPA records do not show all of these as returned to compliance.
Health-based Selenium: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 29 times between January 2022 and July 2025. The EPA record lists a level of 110 UG/L; the limit (MCL) is 50 UG/L. EPA records do not show all of these as returned to compliance.
Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 20 times between January 2023 and July 2023. The EPA record lists a level of 81.4 UG/L; the limit (MCL) is 60 UG/L. EPA records do not show all of these as returned to compliance.
Health-based Interim Enhanced Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in June 2010. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
Health-based Long Term 2 Enhanced Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in June 2010. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between June 2011 and October 2017. All have since returned to compliance, per EPA records.
Monitoring Nitrite: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between January 2016 and January 2017. All have since returned to compliance, per EPA records.
Monitoring Gross Alpha Particle Activity: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between January 2016 and January 2017. All have since returned to compliance, per EPA records.
Monitoring Combined Uranium: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times between January 2016 and January 2017. All have since returned to compliance, per EPA records.
Monitoring Nitrate: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. All have since returned to compliance, per EPA records.
Monitoring Iron: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. EPA records do not show all of these as returned to compliance.
Monitoring Manganese: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. EPA records do not show all of these as returned to compliance.
Monitoring Odor: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. EPA records do not show all of these as returned to compliance.
Monitoring TDS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. EPA records do not show all of these as returned to compliance.
Monitoring Arsenic: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. All have since returned to compliance, per EPA records.
Monitoring Chromium: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. All have since returned to compliance, per EPA records.
Monitoring METHYL TERT-BUTYL ETHER: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. EPA records do not show all of these as returned to compliance.
Monitoring Benzene: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in January 2016. All have since returned to compliance, per EPA records.
Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times between July 2005 and July 2015. All have since returned to compliance, per EPA records.

Lazy H Mutual Water Company

142 served · groundwater · PWSID CA3700937

Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in June 2022. EPA records do not show all of these as returned to compliance.

What this means

A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.

This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.

Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.