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Public water system record

Woodland Park Mutual Water Co

Serves Callender, San Luis Obispo County, CA · 538 people served

Federal records show 11 health-based violations and 3 monitoring/reporting issues for Woodland Park Mutual Water Co in the last ten years. The most serious issue in this window was a Nitrate violation that EPA lists as archived, not resolved.

  • CA4000506
  • ARROYO GRANDE
  • CA
  • 538 served

System profile

Source water Groundwater
ZIP 93420
EPA system ID CA4000506

Verify this system on EPA ECHO →

Health-based violations, last 10 years
11
Resolved
0
Unresolved
0
Archived by EPA
11
Any acute record
Yes
Monitoring issues, last 10 years
3

Key facts

  • Woodland Park Mutual Water Co draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Nitrate, 19 mg/L, federal limit 10 mg/L (1.9 times the limit), 2025.
  • Most recent formal enforcement: compliance order (no penalty) by California, January 2024.
  • Record on file since 1979, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 163 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
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
 330 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Jul 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
 330 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 19 mg/L, federal limit 10 mg/L (1.9 times the limit)
 330 Jan 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 19 mg/L, federal limit 10 mg/L (1.9 times the limit)
 330 Oct 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Jul 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Apr 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Jan 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Oct 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Apr 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Apr 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes

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
 Oct 1, 2023 Resolved
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2020 Resolved
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2018 Resolved

Full record since 1979

EPA's records for Woodland Park Mutual Water Co go back to 1979. Before October 19, 2016 they list no health-based violations and 5 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 0 1
1980s 0 3
1990s 0 1
October 19, 2016 to 2019 0 1
2020s 11 2

Enforcement actions

California regulators took 5 formal enforcement actions against Woodland Park Mutual Water Co between 2019 and 2024. The most recent was a compliance order (no penalty) in January 2024.

Date By Action Violations covered
Jan 17, 2024 California Compliance order (no penalty) 1 violation: Lead and Copper Rule
Jul 14, 2023 California Compliance order (no penalty) 2 violations (2 health-based): Nitrate
Apr 26, 2023 California Compliance order (no penalty) 9 violations (9 health-based): Nitrate
Dec 21, 2020 California Compliance order (no penalty) 1 violation: Lead and Copper Rule
Mar 14, 2019 California Compliance order (no penalty) 1 violation: Lead and Copper Rule

What the violations mean

Nitrate

11 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

Woodland Park Mutual Water Co draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).

Annual water quality report

Woodland Park 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.

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