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Public water system record

Del Dios Mutual Water Company

Serves Del Dios, San Diego County, CA · 330 people served

Federal records show 1 health-based violation and 5 monitoring/reporting issues for Del Dios Mutual Water Company in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • CA3700866
  • ESCONDIDO
  • CA
  • 330 served

System profile

Source water Purchased surface water
ZIP 92029
EPA system ID CA3700866

Verify this system on EPA ECHO →

Health-based violations, last 10 years
1
Resolved
1
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
5

Key facts

  • Del Dios Mutual Water Company draws water from 3 wells.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit), 2017.
  • Most recent formal enforcement: compliance order with a penalty by California, November 2025.
  • Record on file since 1980, with 1 health-based violation before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 164 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2017 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Consumer Confidence Rule
OTHER
 Jul 1, 2024 Active
Enforcement action in place
Revised Total Coliform Rule
Monitoring violation
 Jul 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Revised Total Coliform Rule
Monitoring violation
 Apr 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2020 Resolved
Nitrate
Monitoring and reporting
 Jul 1, 2018 Resolved

Full record since 1980

EPA's records for Del Dios Mutual Water Company go back to 1980. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 14 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 11
1990s 0 1
2000s 1 1
2010 to October 18, 2016 0 1
October 19, 2016 to 2019 1 1
2020s 0 4

Most recent health-based violation before October 19, 2016: Total Coliform, began October 2007, Resolved.

Show the health-based violation before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Oct 1, 2007 Resolved

Enforcement actions

California regulators took 5 formal enforcement actions against Del Dios Mutual Water Company and issued 1 boil water order between 2007 and 2025. The most recent was a compliance order with a penalty in November 2025.

Date By Action Violations covered
Nov 14, 2025 California Compliance order with a penalty 2 violations: Revised Total Coliform Rule
Oct 4, 2024 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
May 8, 2019 California Administrative penalty 1 violation: Nitrate
May 16, 2013 California Compliance order (no penalty) 1 violation: Total Coliform
Oct 13, 2008 California Compliance order (no penalty) 1 violation: Total Coliform
Oct 26, 2007 California Boil water order 1 violation (1 health-based): Total Coliform

What the violations mean

Total Trihalomethanes (TTHMs)

1 incident

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Del Dios Mutual Water Company draws water from 3 wells. It also buys water from Rincon Del Diablo MWD (Id-1).

Buys water from

Annual water quality report

Del Dios Mutual Water Company must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Del Dios Mutual Water Company for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.

Certified drinking water labs by state EPA guidance for private wells