We read 11 results from Rapid Valley Sanitary District’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 10,000 people · Water system ID SD4600274 · 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · sampled 2021 · Customer taps · 2025 report, page 4 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| Bariumhighest measured · range 0.04 to 0.04 · sampled 2021 · 2025 report, page 4 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2021 · Customer taps · 2025 report, page 4 | 0.1 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · 2025 report, page 4 | 8.93 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · 2025 report, page 4 | 32.3 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.25 to 0.66 · 2025 report, page 4 | 0.66 ppm | 1 ppm | 4 ppm | Below the health goal |
| p-Dichlorobenzenehighest measured · range ND to 0.68 · sampled 2021 · 2025 report, page 4 | 0.68 ppb | 75 ppb | 75 ppb | Below the health goal |
| PFHxS (a PFAS)highest measured · range 3.8 to 5.8 · printed as 0.0058 ug/l · sampled 2024 · 2025 report, page 5 | 5.8 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| PFOS (a PFAS)highest measured · printed as ND ug/l · sampled 2024 · 2025 report, page 5 | Not detected | 1 ppt | 4 ppt from 2029 | Not detected |
| Turbidity (cloudiness)highest measured · Treatment plant · 2025 report, page 4 | 0.02 NTU | None set | 1 NTU | Below the legal limit |
| Lithiumhighest measured · range 14 to 23.4 · sampled 2024 · 2025 report, page 5 | 23.4 ppb | 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 Rapid Valley Sanitary District’s water between Mar 2024 and Dec 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS5.7 pptFound in 1 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS5.8 pptFound in 4 of 4 samples · highest resultNo federal limit in force for this one
- Lithium23.4 ppbFound in 2 of 4 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOS (EPA testing)
What removes it: Reverse osmosis.
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