Updated 2026-10-15

County water report

Fresno County Water Quality: 9 Cities Ranked by the Records

Name: Fresno County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Fresno County, California: 9 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Fresno County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)Detected in 3 systems of 9 tested4.0 ng/L federal MCL (2024) · US EPAHighest41 ng/L

CITY OF CLOVIS41 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF FRESNO30 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF SANGER6.7 ng/LSample date: 2024-01-25 to 2024-07-10
CITY OF PARLIERNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
COALINGA-CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluorooctanoic acid (PFOA)Detected in 3 systems of 9 tested4.0 ng/L federal MCL (2024) · US EPAHighest18 ng/L

CITY OF CLOVIS18 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF FRESNO16 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF SANGER5.6 ng/LSample date: 2024-01-25 to 2024-07-10
CITY OF PARLIERNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
COALINGA-CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 9 tested10 ng/L federal MCL (2024) · US EPAHighest30 ng/L

CITY OF FRESNO30 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS8.8 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluorononanoic acid (PFNA)Detected in 2 systems of 9 tested10 ng/L federal MCL (2024) · US EPAHighest8 ng/L

CITY OF FRESNO8 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS6.9 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 9 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest8.6 ng/L

CITY OF FRESNO8.6 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS7.9 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluorohexanoic acid (PFHxA)Detected in 3 systems of 9 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest34 ng/L

CITY OF FRESNO34 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS8 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF SANGER4.7 ng/LSample date: 2024-01-25 to 2024-07-10
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest3.8 gpg

CITY OF CLOVIS3.8 gpgReporting year: 2025

Perfluorobutanoic acid (PFBA)Detected in 2 systems of 9 testedNo federal or state limit; shown for transparencyHighest26 ng/L

CITY OF FRESNO26 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS6.1 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 5.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

4 more contaminants detectedShow

Perfluorodecanoic acid (PFDA)Detected in 1 system of 9 testedNo federal or state limit; shown for transparencyHighest3.1 ng/L

CITY OF CLOVIS3.1 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF FRESNONot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-01 to 2025-12-16
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluoroheptanoic acid (PFHpA)Detected in 2 systems of 9 testedNo federal or state limit; shown for transparencyHighest31 ng/L

CITY OF FRESNO31 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS5.7 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluoropentanesulfonic acid (PFPeS)Detected in 1 system of 9 testedNo federal or state limit; shown for transparencyHighest5.3 ng/L

CITY OF FRESNO5.3 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVISNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-05-04 to 2024-05-16
CITY OF PARLIERNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
CITY OF SANGERNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-25 to 2024-07-10
COALINGA-CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

Perfluoropentanoic acid (PFPeA)Detected in 3 systems of 9 testedNo federal or state limit; shown for transparencyHighest47 ng/L

CITY OF FRESNO47 ng/LSample date: 2023-03-01 to 2025-12-16
CITY OF CLOVIS8.4 ng/LSample date: 2023-05-04 to 2024-05-16
CITY OF SANGER5.1 ng/LSample date: 2024-01-25 to 2024-07-10
CITY OF PARLIERNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-28 to 2025-07-11
COALINGA-CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-05-13
CWS - SELMANot detected · below 3.0 ng/L lab reporting limitSample date: 2025-03-04 to 2025-11-18
KERMAN, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-21 to 2025-09-30
MENDOTA, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2024-07-23
REEDLEY, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-10-20 to 2024-04-19

20 substances tested, none detected in any systemShow

Tested in these 9 systems: CITY OF CLOVIS, CITY OF FRESNO, CITY OF PARLIER, CITY OF SANGER, COALINGA-CITY, CWS - SELMA, KERMAN, CITY OF, MENDOTA, CITY OF, REEDLEY, CITY OF

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
Lead (90th percentile)
Lithium
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

9 cities

Cities ranked by the records

1
ReedleyREEDLEY, CITY OF
No PFAS detected
Open city report →
2
SelmaCWS - SELMA
No PFAS detected
Open city report →
3
CoalingaCOALINGA-CITY
No PFAS detected
Open city report →
4
KermanKERMAN, CITY OF
No PFAS detected
Open city report →
5
MendotaMENDOTA, CITY OF
No PFAS detected
Open city report →
6
ParlierCITY OF PARLIER
No PFAS detected
Open city report →
7
SangerCITY OF SANGER
PFAS sample above a limit
Open city report →
8
FresnoCITY OF FRESNO
PFAS sample above a limit
Open city report →
9
ClovisCITY OF CLOVIS
PFAS sample above a limit
Open city report →

Showing 6 of 9 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Fresno County3 of 9 city reports had a PFAS sample above a 2024 EPA limit

Clovis41 ng/L
Fresno30 ng/L
Sanger6.7 ng/L

4.0 ng/L federal MCL · PFOS, ng/LPFAS in California

Lead

0of 9 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in California

Hard water

1city reports hardness · Clovis, 3.8 gpg

None above 7 gpg, the USGS threshold for hard water. An aesthetic measure with no federal health limit.

Hard water explained

Who supplies the county

Largest water systems

FresnoCITY OF FRESNO · CA1010007
545,970 served
ClovisCITY OF CLOVIS · CA1010003
133,118 served
SangerCITY OF SANGER · CA1010029
26,357 served
ReedleyREEDLEY, CITY OF · CA1010027
26,076 served
SelmaCWS - SELMA · CA1010024
25,651 served
CoalingaCOALINGA-CITY · CA1010004
17,277 served
KermanKERMAN, CITY OF · CA1010018
17,256 served
ParlierCITY OF PARLIER · CA1010025
14,576 served
MendotaMENDOTA, CITY OF · CA1010021
12,595 served

Questions

Frequently asked

How does Fresno County tap water compare across cities?

PurityMap ranks 9 cities in Fresno County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Reedley's main water system: REEDLEY, CITY OF · PWSID CA1010027 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Fresno County cities had a PFAS sample above a 2024 EPA limit?

3 of 9 Fresno County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Clovis (PFOS 41 ng/L), Fresno (PFOS 30 ng/L), Sanger (PFOS 6.7 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 3.

Is there lead in Fresno County tap water?

Utilities report lead as a 90th-percentile result from home taps. 0 of 9 Fresno County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Does Fresno County have hard water?

Hardness is published in utility water-quality reports for 1 Fresno County city on record; the hardest is Clovis at 3.8 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

Next step

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