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Public water system record

CSA No. 31 Stonegate WS

Serves Tres Pinos, San Benito County, CA · 230 people served

Federal records show 1 health-based violation and 1 monitoring/reporting issue for CSA No. 31 Stonegate WS in the last ten years. The most serious issue in this window was a CARBON, TOTAL violation that EPA lists as archived, not resolved.

  • CA3500006
  • HOLLISTER
  • CA
  • 230 served

System profile

Source water Surface water
ZIP 95023
EPA system ID CA3500006

Verify this system on EPA ECHO →

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

Key facts

  • CSA No. 31 Stonegate WS draws water from 1 well and 1 surface water intake.
  • Most recent formal enforcement: compliance order (no penalty) by California, August 2023.
  • Record on file since 1993, with 12 health-based violations before October 20, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 75 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
CARBON, TOTAL
Treatment technique failure
 210 Apr 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No

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
Monitoring violation
 Jul 1, 2023 Resolved

Full record since 1993

EPA's records for CSA No. 31 Stonegate WS go back to 1993. Before October 20, 2016 they list 12 health-based violations (12 resolved) and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 1
2000s 12 0
2010 to October 19, 2016 0 1
2020s 1 1

Most recent health-based violation before October 20, 2016: Total Trihalomethanes (TTHMs), began October 2009, Resolved.

Show all 12 health-based violations before October 20, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Oct 1, 2009 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jul 1, 2009 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Apr 1, 2009 Resolved
CARBON, TOTAL
Treatment technique failure
 Apr 1, 2006 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.82 mg/L, federal limit 0.08 mg/L (10 times the limit)
 Apr 1, 2006 Resolved
CARBON, TOTAL
Treatment technique failure
 Jan 1, 2006 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.82 mg/L, federal limit 0.08 mg/L (10 times the limit)
 Jan 1, 2006 Resolved
CARBON, TOTAL
Treatment technique failure
 Oct 1, 2005 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.82 mg/L, federal limit 0.08 mg/L (10 times the limit)
 Oct 1, 2005 Resolved
CARBON, TOTAL
Treatment technique failure
 Jul 1, 2005 Resolved
CARBON, TOTAL
Treatment technique failure
 Apr 1, 2005 Resolved
CARBON, TOTAL
Treatment technique failure
 Jan 1, 2005 Resolved

Enforcement actions

California regulators took 5 formal enforcement actions against CSA No. 31 Stonegate WS between 2006 and 2023. The most recent was a compliance order (no penalty) in August 2023.

Date By Action Violations covered
Aug 24, 2023 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Aug 19, 2022 California Compliance order (no penalty) 1 violation (1 health-based): CARBON, TOTAL
Nov 4, 2016 California Compliance order (no penalty) 1 violation: Lead and Copper Rule
Jan 14, 2010 California Compliance order (no penalty) 3 violations (3 health-based): Total Trihalomethanes (TTHMs)
Aug 25, 2006 California Compliance order (no penalty) 9 violations (9 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL

What the violations mean

CARBON, TOTAL

1 incident

The system did not complete a treatment step or action that federal rules require for CARBON, TOTAL (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

CSA No. 31 Stonegate WS draws water from 1 well and 1 surface water intake.

Annual water quality report

CSA No. 31 Stonegate WS 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 CSA No. 31 Stonegate WS 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