Aqua Pennsylvania Main System water quality
Aqua's Main System serves more than 800,000 people across the Main Line and beyond, using creek, river and well water disinfected with chloramine. In 2025 its highest PFOA result was 13 ppt, just under Pennsylvania's 14 ppt limit and well above the federal 4 ppt level. Here is what's in the 2025 report, in plain English, and what it means for your home.
Want numbers for your exact address? Get your free water report in seconds →
Aqua PA water, by the numbers
From the Aqua Pennsylvania, 2025 Water Quality Report, Main System (PA1460073), with EPA records where noted.
| 2025 result | |
|---|---|
| Source | Area creeks, the Schuylkill River and wells |
| People served | About 822,600 across the whole Main System (EPA) |
| Areas served | The Main Line, including Malvern, Paoli, Berwyn, Devon, Wayne, Tredyffrin and Easttown, plus parts of West Chester and Exton |
| Disinfectant | Chloramine |
| Hardness | Not listed in the report. We test it free. |
| PFAS | PFOA up to 13 ppt (state limit 14); PFOS up to 7.9 ppt (state limit 18) |
| Nitrate | Up to 4.8 ppm, average 3.1 (limit 10) |
| Lead | Not detected at the 90th percentile; 0 of 60 homes over the action level |
| Trihalomethanes | Up to 29 ppb (limit 80) |
| EPA violations | One groundwater treatment violation on record for 2024 |
What these numbers mean for your home
Chloramine, not chlorine. Aqua PA uses chloramine, which lasts longer in the pipes and is harder to filter than chlorine. It takes catalytic carbon and enough contact time, so tell us you're on Aqua PA and we'll size the filter for it. Whole-home filtration →
PFAS above the federal level. The highest PFAS result here, 13 ppt, is above EPA's federal limit of 4 ppt for PFOA and PFOS. Water systems don't have to meet that limit yet (EPA has proposed 2031). A reverse osmosis system at the kitchen sink reduces PFAS in drinking water. Reverse osmosis →
Hardness isn't listed. Aqua PA's report doesn't publish a hardness number, so we don't guess. Our free in-home test measures it in a few minutes. Free water testing →
Water treatment for Aqua PA customers
How it works
Request your instant free quote
Fill out the free quote form or call (610) 400-3132. Tell us your address and that you're on Aqua PA water.
We quote you on the spot
You get a clear price for your system right then, starting from a base package at a set price.
A free water test tunes your system
Before we install, we test your actual water for free and tune the system to it, so you only pay for the treatment your water needs.
We install your system
We install it cleanly, show you how it works, and let you know when filters and service are due.
Aqua PA water: common questions
Is Aqua Pennsylvania Main System water safe to drink?
Aqua Pennsylvania Main System's 2025 report shows its water met state and federal drinking water standards except where noted in the table above. Meeting the standards doesn't mean nothing is in the water, so many families add filtration for taste, PFAS or hardness.
Does Aqua PA use chlorine or chloramine?
Chloramine. Chloramine needs catalytic carbon to filter well.
Is Aqua PA water hard?
The report doesn't list hardness. We test it free in your home.
What about PFAS in Aqua PA water?
PFOA up to 13 ppt (state limit 14); PFOS up to 7.9 ppt (state limit 18). Pennsylvania's limits are 14 ppt for PFOA and 18 ppt for PFOS; EPA's federal limit is 4 ppt for each.
Do you install water treatment for Aqua PA customers?
Yes. Willow Springs Water Company serves Chester County homes from Sinking Spring. Request an instant free quote or call (610) 400-3132.
Written by Sam Beiler, co-founder of Willow Springs Water Company, Sinking Spring, PA. Last updated November 2026. Willow Springs is not affiliated with Aqua Pennsylvania Main System.