States ›California ›Madera County ›Yosemite Lakes

Yosemite Lakes, CA Tap Water Quality 2026

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

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

Main Utility: Yosemite Spring Park Util Co PWSID: CA2010005 Updated: 2026 Q2
⚠️

PFAS above the federal limit at 2 of 8 sampling points

Lead is 8.40 ppb, 56% of the action level. However, PFAS exceeds the federal limit at 2 of 8 sampling points, running as high as 1.73 times the limit.

F

Yosemite Lakes earns an F for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 8.40 ppb — 56% of the federal action level
PFAS above the federal limit at 2 of 8 sampling points
23 violations since 2015, 13 health-based
1 violation currently open
Yosemite Lakes's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 8.40 ppb — 56% of the federal action level
✓ Lower lead than 5% of California utilities
Population Served
4795
~1957 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 23 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
56% of EPA action level
8.40 ppb
Action level: 15 ppb
The 90th-percentile lead result is 8.40 ppb, 56% 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
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Unaddressed
Fluoride MCL EXCEEDANCE 2.1 MG/L 4.0 mg/L 2022 Resolved
Fluoride MCL EXCEEDANCE 2.1 MG/L 4.0 mg/L 2022 Resolved
Fluoride MCL EXCEEDANCE 2.1 MG/L 4.0 mg/L 2022 Resolved
Fluoride MCL EXCEEDANCE 2.1 MG/L 4.0 mg/L 2022 Resolved
Fluoride MCL EXCEEDANCE 2.2 MG/L 4.0 mg/L 2021 Resolved
Fluoride OTHER — 4.0 mg/L 2021 Resolved
Consumer Confidence Rule OTHER — — 2021 Addressed
Consumer Confidence Rule OTHER — — 2021 Addressed
Fluoride MCL EXCEEDANCE 2.1 MG/L 4.0 mg/L 2021 Resolved
Fluoride OTHER — 4.0 mg/L 2021 Resolved
Fluoride MCL EXCEEDANCE 2.18 MG/L 4.0 mg/L 2021 Resolved
Fluoride MCL EXCEEDANCE 2.2 UG/L 4.0 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Fluoride MCL EXCEEDANCE 2.3 MG/L 4.0 mg/L 2020 Resolved
Fluoride MCL EXCEEDANCE 2.3 MG/L 4.0 mg/L 2020 Resolved
Fluoride MCL EXCEEDANCE 2.3 MG/L 4.0 mg/L 2020 Resolved
Fluoride MCL EXCEEDANCE 2.15 MG/L 4.0 mg/L 2020 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2019 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2016 Resolved
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

1 violation remains open, out of 23 recorded since 2015 (13 health-based).

About the Main Water System

Utility Yosemite Spring Park Util Co
PWSID CA2010005
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 4,795
Service connections 1,957
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Yosemite Lakes tap water safe to drink? ▼
It meets most federal standards, but PFAS exceeds the federal limit at 2 of 8 sampling points. 1 violation(s) remain open. Lead is 8.40 ppb, 56% of the action level.
Does Yosemite Lakes water have PFAS? ▼
Yes. PFAS exceeds the federal limit at 2 of 8 sampling points, running as high as 1.73 times the limit. Limits are enforced on a running annual average at each sampling point, not on a single sample.
Who supplies water to Yosemite Lakes? ▼
Yosemite Spring Park Util Co (PWSID CA2010005). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-06-25. No significant deficiencies were recorded.

What Should Yosemite Lakes Residents Do?

1
Consider a reverse-osmosis filter
Reverse osmosis removes more than 95% of PFAS. Standard carbon pitchers do not.
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
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

Nearby Cities in California

Madera, Ca Tap Water Quality 2026 Madera Chowchilla, Ca Tap Water Quality 2026 Madera Oakhurst, Ca Tap Water Quality 2026 Madera Parksdale, Ca Tap Water Quality 2026 Madera Madera Ranchos, Ca Tap Water Quality 2026 Madera Parkwood, Ca Tap Water Quality 2026 Madera