Water Quality Report · Updated May 12, 2026
CITY OF CLOVIS
CITY OF CLOVIS delivers tap water graded F (50/100) by TapWaterSafety.org. The utility serves approximately 130,130 residents in CLOVIS, California using surface water. 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. For questions, the utility can be reached at 559-324-2662.
Is CLOVIS tap water safe to drink?
CITY OF CLOVIS delivers tap water that earns a grade of F (50/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 130,130 residents in CLOVIS, drawing from surface water.
Public testing data identifies 20 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Perfluorohexane sulfonate (PFHXS), Chloroform, Chromium (hexavalent), Trichloroacetic acid, Bromodichloromethane, Dichloroacetic acid, Perfluorodecanoic acid (PFDA), Nitrate, Perfluorooctanoic acid (PFOA), Perfluorononanoic acid (PFNA), Nitrate and nitrite, Perfluorooctane sulfonate (PFOS), 1,2-Dibromo-3-chloropropane (DBCP), Dibromochloromethane, Chlorate, Vanadium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for CLOVIS residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CITY OF 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.
Contact CITY OF CLOVIS
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for CLOVIS
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 50/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CITY OF CLOVIS service area
This water system serves 1 community in Fresno County, California. Click any city for its dedicated tap water quality page.
Find the right filter for CLOVIS water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.