States › California › Fresno County

Fresno County, CA Water Quality

Water quality data for 36 public water systems serving Fresno County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 36 water systems · 41 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

Fresno County Earns a B

Fresno County: 41 communities across 36 water systems. 85.4% have no open violations.

  • Median lead where detected: 7.55 ppb
  • 8 communities with a lead detection, 33 reporting none detected
  • 8 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 85.4% of communities have no open violations
7.55 ppb
Median Lead Level
County-wide, 90th percentile
36
Water Systems
Active CWS & NTNCWS
85%
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
  • Reedley
    Not detected
    No federal limits exceeded on record
    A
  • Selma
    Not detected
    No federal limits exceeded on record
    A
  • Kerman
    Not detected
    No federal limits exceeded on record
    A
  • Kingsburg
    Not detected
    No federal limits exceeded on record
    A
  • Firebaugh
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Big Creek
    8.70 ppb
    1 violation currently open
    D
  • Tranquillity
    Not detected
    1 violation currently open
    D
  • Parlier
    Not detected
    1 violation currently open
    C
  • Orange Cove
    Not detected
    1 violation currently open
    C
  • Laton
    Not detected
    1 violation currently open
    C
County Lead Level — Median 7.55 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 7.55 ppb — 50.3% of the federal action level
Systems by Lead Level
Under 5 ppb
2
5 – 10 ppb
5
10 – 15 ppb
1
No Data
33

All Cities in Fresno County

Fresno Not detected C
Clovis Not detected C
Sanger Not detected C
Reedley Not detected A
Selma Not detected A
Kerman Not detected A
Parlier Not detected C
Coalinga Not detected C
Mendota Not detected A
Kingsburg Not detected A
Orange Cove Not detected C
Firebaugh Not detected A
Huron Not detected B
Tarpey Village Not detected C
Riverdale 5.70 ppb B
San Joaquin Not detected A
Caruthers Not detected B
Laton Not detected C
Biola Not detected B
Del Rey Not detected B
Malaga Not detected A
Tranquillity Not detected D
West Park Not detected B
Lanare Not detected B
Auberry Not detected B
Sunnyside Not detected C
Friant Not detected B
Cantua Creek 1.60 ppb B
Minkler 6.40 ppb B
Easton 9.00 ppb B
Raisin City Not detected B
Old Fig Garden Not detected C
Three Rocks 13.00 ppb B
Shaver Lake 9.50 ppb C
Squaw Valley Not detected B
Westside Not detected B
Big Creek 8.70 ppb D
Bowles 1.10 ppb B
Mayfair Not detected C
Calwa Not detected C
Fort Washington Not detected C
Showing 41 cities
No active violations Active violations

About Fresno County Drinking Water

Fresno County is served by 36 water systems covering 41 communities. 85% have no open violations.

Of the communities reporting lead results, 8 recorded a detection, with a median of 7.55 ppb — 50% of the federal action level. 33 reported none detected, which means below the laboratory limit rather than an absence of lead.

8 of 41 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 Fresno County tap water safe to drink?▼
85% of communities have no open violation. 8 of 41 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Fresno County?▼
Among communities with a detection the median is 7.55 ppb, 50% of the 15 ppb action level. 33 reported none detected and 0 reported no result.
How many water systems serve Fresno County?▼
36 community water systems serve 41 communities here.
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