Drinking water quality · 2024
· Verified
What's in Clovis, CA tap water
15 contaminants were measured in the Clovis, CA water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 15
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds above EPA limits in Clovis, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (10.3×)2.1× the national p90 (19.900000000000006 ng/L across detecting U.S. systems)
PFOA (Perfluorooctanoic acid)
● Over EPA limit (4.5×)above national p90 (13.649999999999999 ng/L across detecting U.S. systems)
PFHxS (Perfluorohexane sulfonic acid)
● Approaching limit (88%)near national p90 (12.049999999999997 ng/L across detecting U.S. systems)
PFNA (Perfluorononanoic acid)
● Below limitbelow national p90 (25.08 ng/L across detecting U.S. systems)
PFDA
● Detected (no federal limit)below national p90 (0.00995 µg/L across detecting U.S. systems)
PFHpA
● Detected (no federal limit)near national p90 (9.309999999999999 ng/L across detecting U.S. systems)
PFBS
● Detected (no federal limit)near national p90 (13.909999999999979 ng/L across detecting U.S. systems)
PFPeA
● Detected (no federal limit)near national p90 (15.95999999999999 ng/L across detecting U.S. systems)
PFBA
● Detected (no federal limit)below national p90 (18 ng/L across detecting U.S. systems)
PFHxA
● Detected (no federal limit)near national p90 (12.190000000000003 ng/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Clovis, CA's drinking water comes from ground water, drawn from 38 sources.
Source
- WELL 40 - RAW STBY2025
- WELL 037 - RAW
- WELL 17 - RAW
- WELL 12 - BEFORE_GAC-DBCP&TCP
- + 34 more
Treatment
- WELL 41 - TRT CL
- WELL 05A - TRT CL
- WELL 14 - CL2
- + 35 more
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Clovis, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
DBCP worst: 2012 | 0.00057 mg/L 2.8× above national p90 | 0.0002 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2016 | 13 mg/L 1.3× | 10 mg/L | '12'13'14'15'16'17'18'19 |
TTHM worst: 2018 | 0.079 mg/L 99% | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2019 | 9.8 mg/L 98% | 10 mg/L | '16'17'18'19 |
HAA5 worst: 2016 | 0.045 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
SELENIUM worst: 2014 | 0.024 mg/L within | 0.05 mg/L | '14 |
EDB worst: 2017 | 0.00002 mg/L within | 0.00005 mg/L | '17 |
ARSENIC worst: 2018 | 0.0039 mg/L within below national p90 | 0.01 mg/L | '14'15'16'17'18'19 |
BARIUM worst: 2014 | 0.17 mg/L within near national p90 | 2 mg/L | '14'15'16'17'18'19 |
FLUORIDE worst: 2017 | 0.24 mg/L within | 4 mg/L | '12'14'15'16'17'18'19 |
TCAA worst: 2012 | 0.0061 mg/L | — | '12'13'14'15'16'17'18'19 |
COPPER worst: 2018 | 0.074 mg/L below national p90 | — | '18 |
LEAD worst: 2018 | 0.0059 mg/L | — | '18 |
DBAA worst: 2013 | 0.0015 mg/L | — | '13'15'16'17'19 |
DCAA worst: 2012 | 0.014 mg/L | — | '12'13'14'15'16'17'18'19 |
MCAA worst: 2013 | 0.0066 mg/L | — | '13'14'16'17'18'19 |
MBAA worst: 2014 | 0.001 mg/L | — | '14 |
BROMODICHLOROMETHANE worst: 2012 | 0.007 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2016 | 0.0014 mg/L | — | '16'17 |
CHLOROFORM worst: 2012 | 0.035 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0024 mg/L | — | '12'13'14'15'16'17'18'19 |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 3.52 pCi/LAverageSystem-wide | 20 pCi/LMCL | Within the limit |
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 2.34 pCi/LAverageSystem-wide | 15 pCi/LMCL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | 0.76 ng/LAverageSystem-wide | 5 ng/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 1.27 ug/LAverageSystem-wide | 10 ug/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.27 mg/LAverageSystem-wide | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.037 NTUAverageSystem-wide | None set | Detected — no federal limit |
People also ask about Clovis, CA's water
+Is Clovis, CA tap water safe to drink in 2024?
Every one of the 15 contaminants measured in Clovis, CA's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Clovis, CA tap water?
15 contaminants were measured in Clovis, CA's 2024 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 13 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Clovis, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Clovis, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.