We read 15 results from Epcor - Agua Fria’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 127,718 people · Water system ID AZ0407695 · 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 7.3 · Treatment facility effluent · 2025 report, page 8 | 7.31 ppb | 0.004 ppb | 10 ppb | Above the health goal1,827x the health goal |
| Fluoridehighest measured · range ND to 1.61 · Treatment facility effluent · 2025 report, page 8 | 1.61 ppm | 1 ppm | 4 ppm | Above the health goal1.6x the health goal |
| Gross alpha (radioactivity)highest measured · range 0.7 to 1.9 · sampled 2023 · Treatment facility effluent · 2025 report, page 8 | 1.9 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range ND to 0.5 · sampled 2023 · Treatment facility effluent · 2025 report, page 8 | 0.5 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range ND to 0.16 · Treatment facility effluent · 2025 report, page 8 | 0.16 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.77 to 0.95 · Distribution system · 2025 report, page 9 | 0.84 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · range ND to 63 · Treatment facility effluent · 2025 report, page 8 | 63 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of 120 homes tested, 0 over the action level · sampled 2024 · Customer taps (120 samples) · 2025 report, page 9 | 0.23 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 26.7 · Distribution system · 2025 report, page 9 | 14.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 99.3 · Distribution system · 2025 report, page 9 | 53.6 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 120 homes tested, 0 over the action level · sampled 2024 · Customer taps (120 samples) · 2025 report, page 9 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range ND to 3.67 · Treatment facility effluent · 2025 report, page 8 | 3.67 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range ND to 2.5 · Treatment facility effluent · 2025 report, page 8 | 2.5 ppb | 30 ppb | 50 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · Treatment facility · 2025 report, page 9 | 0.23 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumhighest measured · range 61 to 100 · Treatment facility effluent · 2025 report, page 8 | 100 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Epcor - Agua Fria’s water between Feb 2024 and Nov 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium95.7 ppbFound in 30 of 30 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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