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Public water system record

Yosemite NPS-Wawona

Serves an area of Mariposa County, CA · 150 people served

Federal records show no health-based violations and 1 monitoring/reporting issue for Yosemite NPS-Wawona in the last ten years. At least one of these issues remains unresolved.

  • CA2210510
  • YOSEMITE NP
  • CA
  • 150 served

System profile

Source water Surface water
ZIP 95389
EPA system ID CA2210510

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

  • Yosemite NPS-Wawona draws water from 1 surface water intake.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2025.
  • Record on file since 1993, with 5 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 361 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
Consumer Confidence Rule
OTHER
 Jul 1, 2025 Active
Enforcement action in place

Full record since 1993

EPA's records for Yosemite NPS-Wawona go back to 1993. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 4 0
2000s 1 2
2020s 0 1

Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began May 2000, Resolved.

Show all 5 health-based violations before October 19, 2016
Contaminant Start date Status
Surface Water Treatment Rule
Treatment technique failure
 May 1, 2000 Resolved
Surface Water Treatment Rule
Treatment technique failure
 May 1, 1996 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Mar 1, 1995 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jan 1, 1995 Resolved
Total Coliform
Contaminant limit exceeded
 Apr 1, 1993 Resolved

Enforcement actions

California regulators took 3 formal enforcement actions against Yosemite NPS-Wawona between 2006 and 2025. The most recent was a compliance order (no penalty) in December 2025.

Date By Action Violations covered
Dec 11, 2025 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
Nov 9, 2007 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
Nov 14, 2006 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule

Where the water comes from

Yosemite NPS-Wawona draws water from 1 surface water intake.

Annual water quality report

Yosemite NPS-Wawona 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 Yosemite NPS-Wawona 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