We read 12 results from Horsham Water&Sewer Authority’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 26,000 people · Water system ID PA1460033 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 4 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 2 | 1.5 ppb | 0.004 ppb | 10 ppb | Above the health goal375x the health goal |
| Copper90th percentile of 31 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 3 | 0.41 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.4x the health goal |
| Gross alpha (radioactivity)average · range 6.34 to 7.52 · listed as a violation in the report · Wells · 2025 report, page 2 | 6.9 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)average · range ND to 5.6 · listed as a violation in the report · Wells · 2025 report, page 2 | 2.8 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Uraniumaverage · range ND to 8.99 · listed as a violation in the report · printed as 2.7 pCi/L · Wells · 2025 report, page 2 | 4.02 ppb | 0.6 ppb | 30 ppb | Above the health goal6.7x the health goal |
| Bariumaverage · range ND to 0.48 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 2 | 0.21 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 1.47 to 1.92 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 1.7 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)average · range ND to 1.3 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 2 | 0.8 ppb | None set | 100 ppb | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 1.3 to 49.9 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 14.1 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 7.5 to 90.4 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 25.6 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 31 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 2.8 · listed as a violation in the report · Wells · 2025 report, page 2 | 1.3 ppm | 10 ppm | 10 ppm | Below the health goal |
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 Horsham Water&Sewer Authority’s water between Feb 2024 and Aug 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA17.5 pptFound in 1 of 26 samples · highest resultHighest sample is above the 14 ppt Pennsylvania limit. Compliance is judged on averages, not one sample.
- PFOS33.8 pptFound in 1 of 26 samples · highest resultHighest sample is above the 18 ppt Pennsylvania limit. Compliance is judged on averages, not one sample.
- PFHxS10.6 pptFound in 1 of 26 samples · highest resultNo federal limit in force for this one
- PFBS5.7 pptFound in 1 of 26 samples · highest resultNo federal limit in force for this one
- Lithium13.9 ppbFound in 2 of 26 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity), Uranium
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
More districts: Pennsylvania water quality · All states · Something look wrong? Tell us