We read 16 results from Western MWD - Murrieta Division’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 17,453 people · Water system ID CA3310036 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenicaverage · range ND to 5.7 · Murrieta local groundwater · 2025 report, page 10 | 2 ppb | 0.004 ppb | 10 ppb | Above the health goal500x the health goal |
| Chromium-6average · range ND to 0.4 · Murrieta local groundwater · 2025 report, page 10 | 0.1 ppb | 0.02 ppb | 10 ppb | Above the health goal5x the health goal |
| PFOA (a PFAS)single sample · North Well 2 (offline) · 2025 report, page 7 | 5.9 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.5x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Chloramineaverage · range ND to 3.28 · Murrieta distribution system · 2025 report, page 13 | 1.33 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · range 10 to 160 · Murrieta local groundwater, highest of 2 sources · 2025 report, page 11 | 99 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of 30 homes tested, 0 over the action level · 2025 report, page 8 | 0.2 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)average · range 3.6 to 54 · Murrieta distribution system · 2025 report, page 13 | 28.3 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range ND to 0.8 · Murrieta imported surface water, highest of 2 sources · 2025 report, page 10 | 0.2 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 30 homes tested, 0 over the action level · 2025 report, page 8 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 4.8 · Murrieta local groundwater · 2025 report, page 10 | 1 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)single sample · North Well 2 (offline) · 2025 report, page 7 | 3.8 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Sulfateaverage · range 16 to 193 · Murrieta imported surface water, highest of 2 sources · 2025 report, page 11 | 84 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 176 to 594 · Murrieta local groundwater, highest of 2 sources · 2025 report, page 11 | 391 ppm | — | 500 ppm guideline | Within the guideline |
| Boronaverage · range ND to 0.55 · printed as 144 ug/L · Murrieta local groundwater, highest of 2 sources · 2025 report, page 12 | 0.14 ppm | None set | None | No health limit |
| Conductivityaverage · range 304 to 1,054 · Murrieta local groundwater, highest of 2 sources · 2025 report, page 11 | 618 µS/cm | None set | None | No health limit |
| Total organic carbonaverage · range 1.6 to 3.1 · Murrieta imported surface water · 2025 report, page 10 | 2.6 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Western MWD - Murrieta Division’s water between Aug 2023 and Feb 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.5 pptFound in 2 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS5.7 pptFound in 2 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS4.1 pptFound in 2 of 8 samples · highest resultNo federal limit in force for this one
- Lithium37 ppbFound in 4 of 8 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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