We read 10 results from Lompoc-City Water Utility Div’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 40,473 people · Water system ID CA4210006 · 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 2 to 7 · City of Lompoc wells · 2025 report, page 4 | 3.75 ppb | 0.004 ppb | 10 ppb | Above the health goal938x the health goal |
| Sulfateaverage · range 365 to 483 · City of Lompoc wells · 2025 report, page 4 | 424 ppm | — | 250 ppm guideline | Above the guideline1.7x the guideline (taste, odor or stains; not a health limit) |
| Total dissolved solidsaverage · range 690 to 910 · City of Lompoc wells · 2025 report, page 4 | 817 ppm | — | 500 ppm guideline | Above the guideline1.6x the guideline (taste, odor or stains; not a health limit) |
| Uraniumaverage · range ND to 4.99 · printed as 0.57 pCi/L · City of Lompoc wells · 2025 report, page 4 | 0.85 ppb | 0.6 ppb | 30 ppb | Above the health goal1.4x the health goal |
| Chlorideaverage · range 84 to 110 · City of Lompoc wells · 2025 report, page 4 | 96 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.8 to 1.1 · Distribution system · 2025 report, page 4 | 1 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | 0.1 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Lead90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Hardnessaverage · range 14.3 to 18.6 · City of Lompoc wells · 2025 report, page 4 | 17.1 gpg (293 ppm) | — | — | Very hard |
| Sodiumaverage · range 104 to 153 · City of Lompoc wells · 2025 report, page 4 | 134 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. 3 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Lompoc-City Water Utility Div’s water between Apr 2023 and Jan 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium40.5 ppbFound in 2 of 6 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.
Salty taste / high TDS
Found: Sulfate, Total dissolved solids
What removes it: Reverse osmosis.
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