Drinking water quality · 2025
· Verified
What's in Western MWD - Murrieta Division, CA tap water
104 contaminants were measured in the Western MWD - Murrieta Division, CA water system's 2025 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2025
- Contaminants measured
- 104
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- PFOS
- Service area
- CA
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds above EPA limits in Western MWD - Murrieta Division, 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 (1.4×)below national p90 (19.900000000000006 ng/L across detecting U.S. systems)
PFOA (Perfluorooctanoic acid)
● Over EPA limit (1.4×)below national p90 (13.649999999999999 ng/L across detecting U.S. systems)
PFHxS (Perfluorohexane sulfonic acid)
● Below limitbelow national p90 (12.049999999999997 ng/L across detecting U.S. systems)
Lithium
● Detected (no federal limit)below national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Western MWD - Murrieta Division, CA's drinking water comes from ground water, drawn from 2 sources.
Source
- NEW CLAY WELL
- NORTH
Treatment
- NORTH WELL 2 - WATER TREATMENT PLANT
- NEW CLAY WELL - TREATED XCLD
Distribution
Also buys water from EASTERN MUNICIPAL WD, ELSINORE VALLEY MWD.
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Western MWD - Murrieta Division, 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) |
|---|---|---|---|
ARSENIC worst: 2013 | 0.028 mg/L 2.8× 2.1× the national p90 | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2016 | 0.028 mg/L within | 0.06 mg/L | '12'14'15'16'17'18'19 |
TTHM worst: 2018 | 0.031 mg/L within | 0.08 mg/L | '12'14'15'16'17'18'19 |
FLUORIDE worst: 2015 | 0.9 mg/L within | 4 mg/L | '12'14'15'18 |
BARIUM worst: 2015 | 0.31 mg/L within above national p90 | 2 mg/L | '12'15'18 |
SELENIUM worst: 2015 | 0.0062 mg/L within | 0.05 mg/L | '15 |
NITRATE worst: 2014 | 0.362 mg/L within | 10 mg/L | '12'13'14'15'16 |
URANIUM worst: 2015 | 0.00243 ug/L within below national p90 | 30 ug/L | '14'15 |
COPPER worst: 2016 | 0.7 mg/L near national p90 | — | '16 |
DBAA worst: 2012 | 0.0026 mg/L | — | '12'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.0017 mg/L | — | '12'14'15'16'17'18'19 |
MBAA worst: 2012 | 0.0016 mg/L | — | '12'14'15'19 |
MCAA worst: 2012 | 0.0052 mg/L | — | '12'14'15'16'17'19 |
TCAA worst: 2012 | 0.0013 mg/L | — | '12'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0047 mg/L | — | '12'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.004 mg/L | — | '12'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0026 mg/L | — | '12'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0067 mg/L | — | '12'14'15'16'17'18'19 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 995 UMHO/CMAverageEntry point | 1600 UMHO/CMMCL | Within the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 578.3333333333334 MG/LAverageEntry point | 1000 MG/LMCL | Within the limit |
| ColorA measure of visible tint in the water. | 2.6666666666666665 UNITSAverageSource water | 15 UNITSMCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.205 NTUAverageSource water | 5 NTUMCL | Within the limit |
| OdorA measure of detectable smell in the water. | Not detected TONHighest single sampleOther | 3 TONMCL | None detected |
| AlkalinityA measure of the water's capacity to neutralize acids. | 139.72222222222223 MG/LAverageEntry point | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 266.6666666666667 MG/LAverageEntry point | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 8.096666666666668 PHAverageDistribution | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 30.5 UG/LAverageSource water | 50 UG/LMCL | Within the limit |
| IronA naturally occurring metal common in groundwater. | 51 UG/LAverageOther | 300 UG/LMCL | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 1.53 UG/L90th percentileDistribution | 15 UG/LAl | Within the limit |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | 17.666666666666668 UG/LAverageEntry point | 5000 UG/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected UG/LHighest single sampleOther | 1000 UG/LMCL | None detected |
| Antimony | Not detected UG/LHighest single sampleOther | 6 UG/LMCL | None detected |
| Beryllium | Not detected UG/LHighest single sampleOther | 4 UG/LMCL | None detected |
| Cadmium | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | Not detected UG/LHighest single sampleSource water | 10 UG/LMCL | None detected |
| MercuryA toxic metal from erosion of natural deposits and industrial runoff. | Not detected UG/LHighest single sampleSource water | 2 UG/LMCL | None detected |
| NickelA metal from natural deposits and industrial discharge. | Not detected UG/LHighest single sampleSource water | 100 UG/LMCL | None detected |
| Thallium | Not detected UG/LHighest single sampleOther | 2 UG/LMCL | None detected |
| CalciumA naturally occurring mineral that contributes to water hardness. | 39.916666666666664 MG/LAverageEntry point | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 18 MG/LAverageOther | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 4 MG/LAverageOther | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 110 MG/LAverageEntry point | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 5.023333333333333 PCI/LAverageSource water | 15 PCI/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.32602857142857145 PCI/LAverageSource water | 5 PCI/LMCL | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorideA naturally occurring salt compound. | 153.33333333333334 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| SulfateA naturally occurring mineral from rock and soil. | 100 MG/LAverageOther | 500 MG/LMCL | Within the limit |
| Asbestos | Not detected MFLHighest single sampleSource water | 7 MFLMCL | None detected |
| Cyanide | Not detected UG/LHighest single sampleSource water | 150 UG/LMCL | None detected |
| NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits. | Not detected MG/LHighest single sampleSource water | 1 MG/LMCL | None detected |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Carbofuran | Not detected UG/LHighest single sampleSource water | 18 UG/LMCL | None detected |
| Carbon Tetrachloride | Not detected UG/LHighest single sampleOther | 0.5 UG/LMCL | None detected |
| Chlordane | Not detected UG/LHighest single sampleOther | 0.1 UG/LMCL | None detected |
| Chlorobenzene | Not detected UG/LHighest single sampleSource water | 70 UG/LMCL | None detected |
| Chromium | Not detected UG/LHighest single sampleOther | 50 UG/LMCL | None detected |
| Cis Dichloroethylene 12 | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Deha | Not detected UG/LHighest single sampleSource water | 400 UG/LMCL | None detected |
| Dehp | Not detected UG/LHighest single sampleSource water | 4 UG/LMCL | None detected |
| Dichloroethane 12 | Not detected UG/LHighest single sampleOther | 0.5 UG/LMCL | None detected |
| Dichloroethylene 11 | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Dichloropropane 12 | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Dinoseb | Not detected UG/LHighest single sampleOther | 7 UG/LMCL | None detected |
| Diquat | Not detected UG/LHighest single sampleSource water | 20 UG/LMCL | None detected |
| Edb | Not detected UG/LHighest single sampleSource water | 0.05 UG/LMCL | None detected |
| Endothall | Not detected UG/LHighest single sampleOther | 100 UG/LMCL | None detected |
| Endrin | Not detected UG/LHighest single sampleOther | 2 UG/LMCL | None detected |
| Glyphosate | Not detected UG/LHighest single sampleSource water | 700 UG/LMCL | None detected |
| Heptachlor | Not detected UG/LHighest single sampleSource water | 0.01 UG/LMCL | None detected |
| Heptachlor Epoxide | Not detected UG/LHighest single sampleOther | 0.01 UG/LMCL | None detected |
| Hexachlorobenzene | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Hexachlorocyclopentadiene | Not detected UG/LHighest single sampleOther | 50 UG/LMCL | None detected |
| Methoxychlor | Not detected UG/LHighest single sampleOther | 30 UG/LMCL | None detected |
| O Dichlorobenzene | Not detected UG/LHighest single sampleOther | 600 UG/LMCL | None detected |
| Oxamyl | Not detected UG/LHighest single sampleOther | 50 UG/LMCL | None detected |
| P Dichlorobenzene | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Pcb Total | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Pce | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Pentachlorophenol | Not detected UG/LHighest single sampleOther | 1 UG/LMCL | None detected |
| Picloram | Not detected UG/LHighest single sampleSource water | 500 UG/LMCL | None detected |
| Styrene | Not detected UG/LHighest single sampleSource water | 100 UG/LMCL | None detected |
| Tce | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Toxaphene | Not detected UG/LHighest single sampleOther | 3 UG/LMCL | None detected |
| Trans Dichloroethylene 12 | Not detected UG/LHighest single sampleOther | 10 UG/LMCL | None detected |
| Trichlorobenzene 124 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Trichloroethane 111 | Not detected UG/LHighest single sampleOther | 200 UG/LMCL | None detected |
| Trichloroethane 112 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Twofourd | Not detected UG/LHighest single sampleOther | 70 UG/LMCL | None detected |
| Vinyl Chloride | Not detected UG/LHighest single sampleOther | 0.5 UG/LMCL | None detected |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected UG/LHighest single sampleOther | 0.005 UG/LMCL | None detected |
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Benzene | Not detected UG/LHighest single sampleOther | 1 UG/LMCL | None detected |
| Benzo(a)pyrene | Not detected UG/LHighest single sampleOther | 0.2 UG/LMCL | None detected |
| ChloroethaneA volatile organic compound used in some industrial processes. | Not detected UG/LHighest single sampleOther | None set | None detected |
| Chloromethane | Not detected UG/LHighest single sampleSource water | None set | None detected |
| Dalapon | Not detected UG/LHighest single sampleSource water | 200 UG/LMCL | None detected |
| Dichlorodifluoromethane | Not detected UG/LHighest single sampleSource water | None set | None detected |
| Dichloromethane | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Ethylbenzene | Not detected UG/LHighest single sampleSource water | 300 UG/LMCL | None detected |
| Simazine | Not detected UG/LHighest single sampleOther | 4 UG/LMCL | None detected |
| Toluene | Not detected UG/LHighest single sampleSource water | 150 UG/LMCL | None detected |
| XylenesA group of industrial solvents found in gasoline and paint. | Not detected UG/LHighest single sampleOther | 1750 UG/LMCL | None detected |
People also ask about Western MWD - Murrieta Division, CA's water
+Is Western MWD - Murrieta Division, CA tap water safe to drink in 2025?
The 2025 Consumer Confidence Report for the Western MWD - Murrieta Division, CA water utility lists 2 contaminants at or above the federal limit: PFOS and PFOA. 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 Western MWD - Murrieta Division, CA tap water?
104 contaminants were measured in Western MWD - Murrieta Division, CA's 2025 Consumer Confidence Report, spanning other, metals, and vocs & pesticides. 85 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 Western MWD - Murrieta Division, CA tap water?
2 contaminants in Western MWD - Murrieta Division, CA's 2025 report sit at or above the federal limit: PFOS (1.4× the limit); PFOA (1.4× 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 Western MWD - Murrieta Division, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2025 report is PFOS, at 1.4× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Western MWD - Murrieta Division, CA's 2025 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 Western MWD - Murrieta Division, 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 2025 report; a new report will replace it once the utility publishes its next annual update.