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Public water system record

Heritage Ranch CSD

Serves Lake Nacimiento, San Luis Obispo County, CA · 2,956 people served

Federal records show 15 health-based violations and no monitoring/reporting issues for Heritage Ranch CSD in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • CA4010012
  • PASO ROBLES
  • CA
  • 2,956 served

System profile

Source water Surface water
ZIP 93446
EPA system ID CA4010012

Verify this system on EPA ECHO →

Health-based violations, last 10 years
15
Resolved
15
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • Heritage Ranch CSD draws water from 4 infiltration galleries.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.113 mg/L, federal limit 0.06 mg/L (1.9 times the limit), 2022.
  • Most recent formal enforcement: compliance order (no penalty) by California, April 2024.
  • Record on file since 1993, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 2,108 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
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jan 1, 2024 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Oct 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
 220 Jul 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
 220 Apr 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
 220 Jan 1, 2023 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.113 mg/L, federal limit 0.06 mg/L (1.9 times the limit)
 220 Oct 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
 220 Jul 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
 220 Apr 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.074 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Oct 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.079 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
 220 Jul 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.078 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
 220 Apr 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0701 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Jan 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Oct 1, 2019 Resolved No

Full record since 1993

EPA's records for Heritage Ranch CSD go back to 1993. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 1 monitoring or reporting violation.

Violations that began in Health-based Monitoring and reporting
1990s 1 1
2010 to October 18, 2016 2 0
October 19, 2016 to 2019 1 0
2020s 14 0

Most recent health-based violation before October 19, 2016: Total Coliform, began January 2012, Resolved.

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Jan 1, 2012 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 Oct 1, 2010 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jul 1, 1993 Resolved

Enforcement actions

California regulators took 13 formal enforcement actions against Heritage Ranch CSD between 2012 and 2024, filed as 14 records in EPA's data. The most recent was a compliance order (no penalty) in April 2024.

Date By Action Violations covered
Apr 15, 2024 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Feb 27, 2024 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Oct 11, 2023 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Aug 14, 2023 California Compliance order (no penalty) 3 violations (3 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Jan 11, 2023 California Compliance order (no penalty) 2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Oct 4, 2022 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
May 31, 2022 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Dec 31, 2020 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Aug 28, 2020 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
May 27, 2020 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Feb 14, 2020 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Dec 31, 2019 California Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Feb 3, 2012 California Compliance order (no penalty) 1 violation (1 health-based): Total Coliform

What the violations mean

Haloacetic Acids (HAA5)

13 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

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

Heritage Ranch CSD draws water from 4 infiltration galleries.

Annual water quality report

Heritage Ranch CSD 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