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Public water system record

Purissima Hills Water District

Serves Los Altos Hills, Santa Clara County, CA · 6,245 people served

Federal records show no health-based violations and 1 monitoring/reporting issue for Purissima Hills Water District in the last ten years.

  • CA4310021
  • LOS ALTOS HILLS
  • CA
  • 6,245 served

System profile

Source water Purchased surface water
ZIP 94022
EPA system ID CA4310021

Verify this system on EPA ECHO →

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

Key facts

  • Purissima Hills Water District buys its water from San Francisco Regional Water System.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2022.
  • Record on file since 1992, with 4 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 2,324 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.

None since October 2016.

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2020 Resolved

Full record since 1992

EPA's records for Purissima Hills Water District go back to 1992. Before October 19, 2016 they list 4 health-based violations (4 resolved) and no monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 4 0
2020s 0 1

Most recent health-based violation before October 19, 2016: Total Coliform, began November 1999, Resolved.

Show all 4 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Nov 1, 1999 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Aug 1, 1998 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Mar 1, 1995 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Mar 1, 1992 Resolved

Enforcement actions

California regulators took 3 formal enforcement actions against Purissima Hills Water District between 1992 and 2022. The most recent was a compliance order (no penalty) in December 2022.

Date By Action Violations covered
Dec 27, 2022 California Compliance order (no penalty) 1 violation: Lead and Copper Rule
Apr 2, 1997 California Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule
Apr 3, 1992 California Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule

Where the water comes from

Purissima Hills Water District buys its water from San Francisco Regional Water System. It lists no wells or intakes of its own. It also has emergency connections to CWSC Los Altos Suburban and City of Palo Alto. 2 other public water systems have emergency connections to Purissima Hills Water District.

Buys water from

Emergency or part-time connections to

Annual water quality report

Purissima Hills Water District 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.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

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