We read 21 results from Rubidoux Community Sd’s 2025 water quality report. No results over a legal limit; 8 above a health goal or guideline.
Serves about 36,827 people · Water system ID CA3310044 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 3.8 · listed as a violation in the report · Wells · 2025 report, page 6 | 3.8 ppb | 0.004 ppb | 10 ppb | Above the health goal950x the health goal |
| Chromium-6average · range ND to 5.7 · listed as a violation in the report · Wells · 2025 report, page 6 | 2 ppb | 0.02 ppb | 10 ppb | Above the health goal100x the health goal |
| Copper90th percentile of 31 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 6 | 0.52 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.7x the health goal |
| Gross alpha (radioactivity)average · range 2.36 to 5.54 · listed as a violation in the report · sampled 2023 · Wells · 2025 report, page 6 | 4.23 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 31 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 6 | 1.6 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal8x the health goal |
| Radium (combined 226 + 228)average · range ND to 0.68 · listed as a violation in the report · sampled 2023 · Wells · 2025 report, page 6 | 0.29 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Total dissolved solidsaverage · range 420 to 670 · Wells · 2025 report, page 7 | 517 ppm | — | 500 ppm guideline | Above the guideline1x the guideline (taste, odor or stains; not a health limit) |
| Uraniumaverage · range 4.55 to 8.81 · listed as a violation in the report · printed as 4.13 pCi/L · sampled 2023 · Wells · 2025 report, page 6 | 6.15 ppb | 0.6 ppb | 30 ppb | Above the health goal10x the health goal |
| Bariumaverage · range ND to 0.1 · listed as a violation in the report · Wells · 2025 report, page 6 | 0.1 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.86 to 1.11 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 1 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 3.4 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 2.7 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 5.6 to 23.4 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 19.9 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.25 to 0.61 · listed as a violation in the report · Wells · 2025 report, page 6 | 0.61 ppm | 1 ppm | 2 ppm | Below the health goal |
| Nitrate (as N)average · range 3 to 8.9 · listed as a violation in the report · Wells · 2025 report, page 6 | 5.6 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchlorateaverage · range ND to 1.8 · listed as a violation in the report · Wells · 2025 report, page 6 | 0.2 ppb | 1 ppb | 6 ppb | Below the health goal |
| Sulfateaverage · range 75 to 90 · Wells · 2025 report, page 7 | 80 ppm | — | 250 ppm guideline | Within the guideline |
| Hardnessaverage · range 12.3 to 19.9 · Wells · 2025 report, page 7 | 16 gpg (273 ppm) | — | — | Very hard |
| PFBA (a PFAS)average · range ND to 25 · Wells · 2025 report, page 7 | 15.1 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 14 · Wells · 2025 report, page 7 | 4.7 ppt | None set | None | No health limit |
| PFPeA (a PFAS)average · range ND to 38 · Wells · 2025 report, page 7 | 16.6 ppt | None set | None | No health limit |
| Sodiumaverage · range 40 to 70 · Wells · 2025 report, page 7 | 59.2 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.
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: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228), Uranium
What removes it: Reverse osmosis.
Salty taste / high TDS
Found: Total dissolved solids
What removes it: Reverse osmosis.
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