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Three Rocks, CA Tap Water Quality 2026

Water quality report for Three Rocks, CA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Three Rocks's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Fcsa 30 - El Porvenir PWSID: CA1000019 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 13.00 ppb, 87% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Three Rocks earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 13.00 ppb — 87% of the federal action level
PFAS never sampled at this system
69 violations since 2015, 65 health-based
No violations currently open
Three Rocks's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 13.00 ppb — 87% of the federal action level
✓ Lower lead than 2% of California utilities
Population Served
248
~56 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
69 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
87% of EPA action level
13.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 13.00 ppb, 87% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MCL EXCEEDANCE 222.5 MG/L 0.080 mg/L 2023 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 160.7 MG/L 0.060 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 265 MG/L 0.080 mg/L 2023 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 155.7 MG/L 0.060 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 265 MG/L 0.080 mg/L 2023 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 131.7 MG/L 0.060 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 270 MG/L 0.080 mg/L 2023 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 92.3 MG/L 0.060 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 303 MG/L 0.080 mg/L 2022 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 116.8 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 266.7 MG/L 0.080 mg/L 2022 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 98.7 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 2475 MG/L 0.080 mg/L 2022 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0968 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.2175 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.068 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.24 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.773 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.2225 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0785 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.2225 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0785 MG/L 0.060 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.085 MG/L 0.060 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.237 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.087 MG/L 0.060 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.207 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.15 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.08 MG/L 0.060 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.13 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.077 MG/L 0.060 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.14 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 83 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.066 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.126 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.146 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.068 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.169 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.064 MG/L 0.060 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.165 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.163 MG/L 0.080 mg/L 2018 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.07 MG/L 0.060 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.14 MG/L 0.080 mg/L 2018 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2018 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.105 MG/L 0.060 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.12 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.16 MG/L 0.080 mg/L 2017 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.102 MG/L 0.060 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.16 MG/L 0.080 mg/L 2017 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.102 MG/L 0.060 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.1725 MG/L 0.080 mg/L 2017 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.1075 MG/L 0.060 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.205 MG/L 0.080 mg/L 2017 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.095 MG/L 0.060 mg/L 2017 Archived
Lead and Copper Rule MONITORING AND REPORTING — TT 2016 Resolved
TTHM MCL EXCEEDANCE 0.2 MG/L 0.080 mg/L 2016 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.0998 MG/L 0.060 mg/L 2016 Archived
Stage 2 Disinfectants and Disinfection Byproducts Rule OTHER — — 2016 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2016 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.2333 MG/L 0.080 mg/L 2016 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.1247 MG/L 0.060 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.233 MG/L 0.080 mg/L 2016 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.1 MG/L 0.060 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.223 MG/L 0.080 mg/L 2015 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.08 MG/L 0.060 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.22 MG/L 0.080 mg/L 2015 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.094 MG/L 0.060 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.245 MG/L 0.080 mg/L 2015 Archived
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

69 violations are on record since 2015, of which 65 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Fcsa 30 - El Porvenir
PWSID CA1000019
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 248
Service connections 56
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Three Rocks tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 13.00 ppb, 87% of the action level.
Does Three Rocks water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Three Rocks? ▼
Fcsa 30 - El Porvenir (PWSID CA1000019). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2022-01-13. No significant deficiencies were recorded.

What Should Three Rocks Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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