We read 12 results from Montgomery County Water Services 1 Pws’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 150,207 people · Water system ID OH5701315 · 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 |
|---|---|---|---|---|
| PFHxS (a PFAS)average · range 6.7 to 23.3 · Dayton Ottawa plant, highest of 2 sources · 2025 report, page 4 | 13.5 ppt | None set | 10 ppt from 2029 | Above the federal limit that takes effect in 20291.4x the 10 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 10 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOA (a PFAS)average · range 2.9 to 4.4 · South service area, highest of 2 sources · 2025 report, page 5 | 3.3 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal471x the health goal |
| PFOS (a PFAS)average · range 5.45 to 13.7 · Dayton Ottawa plant, highest of 3 sources · 2025 report, page 4 | 8.81 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20292.2x 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. |
| Bariumhighest measured · listed as a violation in the report · Dayton Ottawa plant, highest of 2 sources · 2025 report, page 4 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloraminehighest running annual average · range 1.15 to 1.34 · listed as a violation in the report · South service area, highest of 2 sources · 2025 report, page 5 | 1.25 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 54 homes tested, 0 over the action level · South service area taps (54 samples), highest of 2 sources · 2025 report, page 5 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 24.6 · listed as a violation in the report · North service area · 2025 report, page 5 | 6.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 18.2 to 57.3 · listed as a violation in the report · North service area, highest of 2 sources · 2025 report, page 5 | 44.9 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.8 to 1.1 · listed as a violation in the report · Dayton Miami plant, highest of 2 sources · 2025 report, page 4 | 0.95 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of 32 homes tested, 0 over the action level · North service area taps (32 samples), highest of 2 sources · 2025 report, page 5 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range ND to 1.71 · listed as a violation in the report · Dayton Miami plant, highest of 2 sources · 2025 report, page 4 | 1.71 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Dayton Miami plant, highest of 2 sources · 2025 report, page 5 | 0.09 NTU | None set | 1 NTU | Below the legal 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 Montgomery County Water Services 1 Pws’s water between Jul 2023 and Apr 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS9.6 pptFound in 2 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS10.7 pptFound in 2 of 4 samples · highest resultNo federal limit in force for this one
- PFBS3.2 pptFound in 3 of 4 samples · highest resultNo federal limit in force for this one
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: PFHxS (a PFAS), PFOA (a PFAS), PFOS (a PFAS), PFOS (EPA testing)
What removes it: Reverse osmosis.
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