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Public water system record

San Miguelito MWC

Serves Avila Beach, San Luis Obispo County, CA · 1,600 people served

Federal records show 2 health-based violations and no monitoring/reporting issues for San Miguelito MWC in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • CA4010003
  • AVILA BEACH
  • CA
  • 1,600 served

System profile

Source water Purchased surface water
ZIP 93424
EPA system ID CA4010003

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • San Miguelito MWC draws water from 3 wells.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit), 2023.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2023.
  • Record on file since 1993, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 688 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
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2017 Resolved No

Full record since 1993

EPA's records for San Miguelito MWC go back to 1993. Before October 19, 2016 they list no health-based violations and 1 monitoring or reporting violation.

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

Enforcement actions

California regulators took 2 formal enforcement actions against San Miguelito MWC between 2017 and 2023. The most recent was a compliance order (no penalty) in December 2023.

Date By Action Violations covered
Dec 19, 2023 California Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Mar 17, 2017 California Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

2 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

San Miguelito MWC draws water from 3 wells. It also buys water from Central Coast Water Authority.

Buys water from

Annual water quality report

San Miguelito MWC 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