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Public water system record

Rancho Estates Mutual Water Co.

Serves an area of San Diego County, CA · 200 people served

Federal records show 6 health-based violations and 1 monitoring/reporting issue for Rancho Estates Mutual Water Co. in the last ten years. The most serious issue in this window was a resolved Nitrate-Nitrite violation.

  • CA3700936
  • PAUMA VALLEY
  • CA
  • 200 served

System profile

Source water Groundwater
ZIP 92061
EPA system ID CA3700936

Verify this system on EPA ECHO →

Health-based violations, last 10 years
6
Resolved
6
Unresolved
0
Any acute record
Yes
Monitoring issues, last 10 years
1

Key facts

  • Rancho Estates Mutual Water Co. draws water from 4 wells.
  • Highest measured level in the last 10 years: Nitrate, 16.6 mg/L, federal limit 10 mg/L (1.7 times the limit), 2017.
  • Most recent formal enforcement: compliance order with a penalty by California, April 2017.
  • Record on file since 1982, with 4 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 90 service lines.

Check whether Rancho Estates Mutual Water Co. serves your address

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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
Nitrate-Nitrite
Contaminant limit exceeded
 330 Apr 1, 2018 Resolved Yes
Nitrate-Nitrite
Contaminant limit exceeded
 330 Jan 1, 2018 Resolved Yes
Nitrate-Nitrite
Contaminant limit exceeded
 330 Oct 1, 2017 Resolved Yes
Nitrate-Nitrite
Contaminant limit exceeded
 330 Jul 1, 2017 Resolved Yes
Nitrate
Contaminant limit exceeded
Measured 10.6 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Apr 1, 2017 Resolved Yes
Nitrate
Contaminant limit exceeded
Measured 16.6 mg/L, federal limit 10 mg/L (1.7 times the limit)
 330 Jan 1, 2017 Resolved Yes

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Revised Total Coliform Rule
RPT
 Sep 1, 2017 Resolved

Full record since 1982

EPA's records for Rancho Estates Mutual Water Co. go back to 1982. Before October 19, 2016 they list 4 health-based violations (4 resolved) and 17 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 1
2000s 1 5
2010 to October 18, 2016 3 11
October 19, 2016 to 2019 6 1

Most recent health-based violation before October 19, 2016: Nitrate (acute), began April 2016, Resolved.

Show all 4 health-based violations before October 19, 2016
Contaminant Start date Status
Nitrate (acute)
Contaminant limit exceeded
Measured 14.2 mg/L, federal limit 10 mg/L (1.4 times the limit)
 Apr 1, 2016 Resolved
Nitrate (acute)
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
 Jan 1, 2016 Resolved
Total Coliform
Contaminant limit exceeded
 Apr 1, 2015 Resolved
Total Coliform
Contaminant limit exceeded
 Oct 1, 2007 Resolved

Enforcement actions

California regulators took 15 formal enforcement actions against Rancho Estates Mutual Water Co. and issued 1 boil water order between 2005 and 2017. The most recent was a compliance order with a penalty in April 2017.

Date By Action Violations covered
Apr 25, 2017 California Compliance order with a penalty 8 violations (8 health-based): Nitrate, Nitrate-Nitrite
Mar 31, 2016 California Compliance order (no penalty) 3 violations (3 health-based): Nitrate
Jan 26, 2016 California Compliance order (no penalty) 3 violations: Nitrate, Benzene, Combined Uranium
Apr 2, 2015 California Compliance order (no penalty) 1 violation (1 health-based): Total Coliform
Nov 14, 2014 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
Jul 19, 2013 California Compliance order (no penalty) 1 violation: Total Coliform
Jun 18, 2013 California Compliance order (no penalty) 1 violation: Total Coliform
Apr 3, 2013 California Compliance order (no penalty) 2 violations: Total Trihalomethanes (TTHMs), Lead and Copper Rule
Jun 15, 2011 California Compliance order (no penalty) 2 violations: Lead and Copper Rule, Total Trihalomethanes (TTHMs)
Mar 11, 2010 California Compliance order (no penalty) 1 violation: Total Coliform
Aug 11, 2008 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
Jan 11, 2008 California Compliance order (no penalty) 1 violation: Total Coliform
Oct 28, 2007 California Boil water order 1 violation (1 health-based): Total Coliform
Oct 10, 2005 California Compliance order (no penalty) 1 violation: Total Coliform
Jun 20, 2005 California Compliance order (no penalty) 1 violation: Total Coliform
Mar 18, 2005 California Compliance order (no penalty) 1 violation: Total Coliform

What the violations mean

Nitrate-Nitrite

4 incidents

Test results for Nitrate-Nitrite were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Nitrate

2 incidents

Nitrate exceeded the federal limit

High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome

Where the water comes from

Rancho Estates Mutual Water Co. draws water from 4 wells. It also buys water from Yuima Municipal Water District.

Buys water from

Annual water quality report

Rancho Estates Mutual Water Co. 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 Rancho Estates Mutual Water Co. 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