We read 12 results from Carlisle Water Trmt Plt’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 26,000 people · Water system ID PA7210002 · 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 |
|---|---|---|---|---|
| PFOA (a PFAS)highest measured · range 2.6 to 5.5 · listed as a violation in the report · Treatment plant · 2025 report | 5.5 ppt | 0.007 ppt | 14 ppt (Pennsylvania) now; 4 ppt from 2029 | Above the federal limit that takes effect in 20291.4x the 4 ppt federal limit that takes effect in 2029; below the 14 ppt Pennsylvania limitNot a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOS (a PFAS)highest measured · range 7.3 to 13.9 · listed as a violation in the report · Treatment plant · 2025 report | 13.9 ppt | 1 ppt | 18 ppt (Pennsylvania) now; 4 ppt from 2029 | Above the federal limit that takes effect in 20293.5x the 4 ppt federal limit that takes effect in 2029; below the 18 ppt Pennsylvania limitNot a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Bariumsingle sample · listed as a violation in the report · Treatment plant · 2025 report | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 1.37 to 1.93 · listed as a violation in the report · Distribution system · 2025 report | 1.37 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report | 0.12 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest measured · range 27 to 51 · listed as a violation in the report · Distribution system · 2025 report | 51 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 22 to 59 · listed as a violation in the report · Distribution system · 2025 report | 59 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridesingle sample · listed as a violation in the report · Treatment plant · 2025 report | 0.54 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)single sample · listed as a violation in the report · Treatment plant · 2025 report | 2.4 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFBA (a PFAS)average · printed as 0.0052 ppb · Treatment plant · 2025 report | 5.2 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · printed as 0.0051 ppb · Treatment plant · 2025 report | 5.1 ppt | None set | None | No health limit |
| PFPeA (a PFAS)average · printed as 0.0039 ppb · Treatment plant · 2025 report | 3.9 ppt | 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. 2 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 Carlisle Water Trmt Plt’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5 pptFound in 2 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS11.3 pptFound in 4 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFBS7.2 pptFound in 2 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: PFOA (a PFAS), PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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