Drinking water quality · 2024
· Verified
What's in West Covina, CA tap water
37 contaminants were measured in the West Covina, CA water system's 2024 annual report. Each is shown below against its federal limit — 4 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 37
- Over federal limit
- 4
- Approaching the limit
- 0
- Worst contaminant
- Specific Conductance
- Service area
- CA
- Specific ConductancePhysical & aggregate · Average420limit 1 · 420.0× the limit
- Total Dissolved SolidsPhysical & aggregate · Average253 mg/Llimit 1 mg/L · 253.0× the limit
- BoronMetals · Average140 mg/Llimit 1 mg/L · 140.0× the limit
- Combined RadiumRadionuclides · Average0.82 pCi/Llimit 0.05 pCi/L · 16.4× the limit
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in West Covina, 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.
Lithium
● Detected (no federal limit)near national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
West Covina, CA buys its drinking water from COVINA IRRIGATING CO., THREE VALLEYS MWD.
Source
Treatment
Distribution
Also buys water from COVINA IRRIGATING CO., THREE VALLEYS MWD.
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in West Covina, 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) |
|---|---|---|---|
TTHM worst: 2014 | 0.12 mg/L 1.5× | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2014 | 0.062 mg/L 1.0× | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
DBAA worst: 2012 | 0.013 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.019 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2014 | 0.0067 mg/L | — | '14 |
TCAA worst: 2012 | 0.019 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.019 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.019 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.048 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.035 mg/L | — | '12'13'14'15'16'17'18'19 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 420AverageAverage Amount | 1MCL | At or above the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 253 mg/LAverageAverage Amount | 1 mg/LMCL | At or above the limit |
| OdorA measure of detectable smell in the water. | 1AverageAverage Amount | 3MCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.58 NTUAverageAverage Amount | 5 NTUMCL | Within the limit |
| ColorA measure of visible tint in the water. | Not detectedAverageAverage Amount | 15MCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 170 mg/LAverageAverage Amount | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 130 mg/LAverageAverage Amount | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 8.25AverageAverage Amount | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.2 mg/LAverageAverage Amount | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BoronA naturally occurring element from rock and soil. | 140 mg/LAverageAverage Amount | 1 mg/LNL | At or above the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.74 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| Vanadium | 3.7 ug/LAverageAverage Amount | 50 ug/LNL | Within the limit |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.5 ug/LAverageAverage Amount | 10 ug/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected mg/LAverageAverage Amount | 1 mg/LMCL | None detected |
| BariumA metal from erosion of natural deposits and industrial discharge. | Not detected mg/LAverageAverage Amount | 1 mg/LMCL | None detected |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0 ug/L90th percentileAt the tap | 15 ug/LAction level | None detected |
| CalciumA naturally occurring mineral that contributes to water hardness. | 62 mg/LAverageAverage Amount | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 11 mg/LAverageAverage Amount | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.4 mg/LAverageAverage Amount | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 46 mg/LAverageAverage Amount | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.82 pCi/LAverageAverage Amount | 0.05 pCi/LPublic health goal | At or above the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2.5 pCi/LAverageAverage Amount | 20 pCi/LMCL | Within the limit |
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 2.3 pCi/LAverageAverage Amount | 50 pCi/LMCL | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 4 ng/LAverageAverage Amount | 5.1 ng/LNL | Within the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 1.43 ng/LAverageAverage Amount | 500 ng/LNL | Within the limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 2.08 ng/LAverageAverage Amount | None set | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 4.65 ng/LAverageAverage Amount | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 3.7 ng/LAverageAverage Amount | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 1 mg/LAverageAverage Amount | 2 mg/LMCL | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2 mg/LAverageAverage Amount | 10 mg/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 56 mg/LAverageAverage Amount | 500 mg/LMCL | Within the limit |
| SulfateA naturally occurring mineral from rock and soil. | 31 mg/LAverageAverage Amount | 500 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 56 ug/LAverageAverage Amount | 800 ug/LNL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 2.35 mg/LAverageAverage Amount | None set | Detected — no federal limit |
People also ask about West Covina, CA's water
+Is West Covina, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the West Covina, CA water utility lists 4 contaminants at or above the federal limit: Specific Conductance, Total Dissolved Solids, Boron, and Combined Radium. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in West Covina, CA tap water?
37 contaminants were measured in West Covina, CA's 2024 Consumer Confidence Report, spanning metals, physical & aggregate, and pfas ("forever chemicals"). 24 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in West Covina, CA tap water?
4 contaminants in West Covina, CA's 2024 report sit at or above the federal limit: Specific Conductance (420.0× the limit); Total Dissolved Solids (253.0× the limit); Boron (140.0× the limit); Combined Radium (16.4× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in West Covina, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Specific Conductance, at 420.0× the federal threshold. It belongs to the physical & aggregate family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from West Covina, 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 West Covina, 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.