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Madera County, CA Water Quality

Water quality data for 15 public water systems serving Madera County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 15 water systems · 16 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Madera County Earns a B

Madera County: 16 communities across 15 water systems. 87.5% have no open violations.

  • Median lead where detected: 3.60 ppb
  • 10 communities with a lead detection, 6 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 87.5% of communities have no open violations
3.6 ppb
Median Lead Level
County-wide, 90th percentile
15
Water Systems
Active CWS & NTNCWS
87%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Madera Acres
    3.00 ppb
    No federal limits exceeded on record
    A
  • Madera
    3.00 ppb
    No federal limits exceeded on record
    A
  • Chowchilla
    Not detected
    No federal limits exceeded on record
    A
  • Parkwood
    Not detected
    No federal limits exceeded on record
    B
  • Coarsegold
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Yosemite Lakes
    8.40 ppb
    PFAS above the limit at 2 of 8 sampling points
    F
  • Rolling Hills
    4.20 ppb
    1 violation currently open
    C
  • Oakhurst
    5.00 ppb
    34 health-based violations since 2015
    B
  • North Fork
    Not detected
    35 health-based violations since 2015
    B
  • Bass Lake
    2.00 ppb
    Copper above the 1,300 ppb action level
    A
County Lead Level — Median 3.6 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3.6 ppb — 24% of the federal action level
Systems by Lead Level
Under 5 ppb
6
5 – 10 ppb
4
No Data
6

All Cities in Madera County

Madera 3.00 ppb A
Chowchilla Not detected A
Yosemite Lakes 8.40 ppb F
Oakhurst 5.00 ppb B
Parksdale Not detected B
Madera Ranchos 5.40 ppb B
Parkwood Not detected B
Coarsegold Not detected B
Ahwahnee 6.00 ppb B
Rolling Hills 4.20 ppb C
La Vina Not detected B
Bass Lake 2.00 ppb A
North Fork Not detected B
Fairmead 1.60 ppb B
Bonadelle Ranchos 1.00 ppb B
Madera Acres 3.00 ppb A
Showing 16 cities
No active violations Active violations

About Madera County Drinking Water

Madera County is served by 15 water systems covering 16 communities. 88% have no open violations.

Of the communities reporting lead results, 10 recorded a detection, with a median of 3.60 ppb — 24% of the federal action level. 6 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 16 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Madera County tap water safe to drink?▼
88% of communities have no open violation. 1 of 16 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Madera County?▼
Among communities with a detection the median is 3.60 ppb, 24% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve Madera County?▼
15 community water systems serve 16 communities here.
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