Tap Water Quality Report
Tap water quality in CLOVIS, California
Tap water in CLOVIS, California receives a grade of F (50/100) from TapWaterSafety.org. It's served by CITY OF CLOVIS. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA5) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CLOVIS's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CLOVIS.
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 35.7 ppb, 357x above the EWG health guideline of 0.1 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.918 ppb, 230x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 11.3 ppb, 188x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF CLOVIS (system ID CA1010003) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CLOVIS
Filters matched to the specific contaminants in CLOVIS's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CLOVIS's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
35.7 ppb | 0.1 | 60.0 | 60 | — | — | — | 357× over |
| Arsenic Heavy metal |
0.918 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 230× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
11.3 ppb | 0.06 | — | — | — | — | — | 188× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
26.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 174× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.074 ppt | 0.001 | 10.0 | — | — | — | — | 74× over |
| Chloroform Disinfection byproduct |
22.7 ppb | 0.4 | — | — | — | — | — | 57× over |
| Chromium (hexavalent) Heavy metal |
0.991 ppb | 0.02 | — | — | — | — | — | 50× over |
| Trichloroacetic acid Disinfection byproduct |
4.82 ppb | 0.1 | — | — | — | — | — | 48× over |
| Bromodichloromethane Disinfection byproduct |
2.32 ppb | 0.06 | — | — | — | — | — | 39× over |
| Dichloroacetic acid Disinfection byproduct |
7.4 ppb | 0.2 | — | — | — | — | — | 37× over |
| Perfluorodecanoic acid (PFDA) PFAS |
0.213 ppt | 0.006 | — | — | — | — | — | 36× over |
| Nitrate Inorganic |
4.63 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 33× over |
| Perfluorooctanoic acid (PFOA) PFAS |
2.33 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 26× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.151 ppt | 0.006 | 10.0 | — | — | — | — | 25× over |
| Nitrate and nitrite Inorganic |
3.06 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 22× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
3.93 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 13× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.0206 ppb | 0.0017 | 0.2 | — | — | — | — | 12× over |
| Dibromochloromethane Disinfection byproduct |
0.522 ppb | 0.1 | — | — | — | — | — | 5.2× over |
| Chlorate Disinfection byproduct |
284.3 ppb | 210.0 | — | — | — | — | — | 1.4× over |
| Vanadium Other |
23.9 ppb | 21.0 | — | — | — | — | — | 1.1× over |
| Radium, combined (-226 and -228) Radiological |
0.05 pCi/L | 0.05 | 5.0 | — | — | — | — | Below guideline |
| Dibromoacetic acid Disinfection byproduct |
0.024 ppb | 0.03 | — | — | — | — | — | Below guideline |
| 1,2,3-Trichloropropane Other |
9.9e-05 ppb | 0.0007 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0611 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
9.04 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
56.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
2.78 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
6.31 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.118 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Chloromethane Other |
0.00448 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.11 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.61 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.18 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.448 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.215 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.154 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.119 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.00432 ppb | — | — | — | — | — | — | Below guideline |
| Nitrite Inorganic |
0.00119 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from CITY OF CLOVIS.