Malvern water treatment
What's in Malvern's water, where it comes from, and how to fix what you find. Check your ZIP for your utility's EPA records.
Your water in Malvern
Malvern is a small borough on the Main Line's western end, and the 19355 ZIP stretches across East Whiteland, Willistown, Charlestown, and parts of Tredyffrin. Public water here comes mainly from Aqua Pennsylvania's Main System, which serves about 822,600 people across the region[1]. About 65% of the ZIP's land area lies outside mapped service areas, so many homes in the wooded, larger-lot neighborhoods use private wells.
Aqua's Main System had one health-based violation in the last three years, a water treatment rule violation in November 2024, since resolved. Its EPA UCMR 5 samples found PFOA up to 12.6 ppt and PFOS up to 9.2 ppt, above the 4.0 ppt federal limit that takes effect in 2029[2].
Because Malvern splits so sharply between Aqua customers in and near the borough and well owners on larger lots in Willistown and Charlestown, two neighbors can need completely different equipment. A home on Aqua usually starts with PFAS reduction for drinking water; a Malvern well home should rule out bacteria, low pH, and radon before choosing anything.
Local issues to know
- Corrosive wells: 83.3% of Chester County well samples tested for corrosivity by Penn State were outside the non-corrosive range[3], which can cause blue-green stains and leach metals from plumbing[4].
- Radon: 14% of 1,041 USGS-sampled Pennsylvania wells exceeded 4,000 pCi/L[5].
- PFAS on Aqua's Main System, as above.
Utility or well? ZIP 19355: about 65% of the land area lies outside mapped public water service areas[1]. Homes in those areas are likely on private wells, which no utility tests. If that's you, start with a free in-home test.
Utility records
Aqua Pennsylvania (Main System)
EPA water system ID PA1460073 · serves about 822,600 people · surface water (rivers, streams, or reservoirs)
- Health violations
- 1 health-based violation in the last three years (water treatment rule (filtration / disinfection), Nov 2024, resolved); 1 older on record[1]
- Lead
- 0 ppb at the 90th percentile of its most recent lead sampling (EPA action level: 15 ppb)[6]
- PFAS
- EPA UCMR 5 sampling found PFOA up to 12.6 ppt, PFOS up to 9.2 ppt, PFPeA up to 21.8 ppt, PFHxA up to 17.2 ppt, so PFOA and PFOS were above the 4.0 ppt federal limit that takes effect in 2029.[2]
Full EPA record for this system · Ask the utility for its annual Consumer Confidence Report (CCR) for hardness and other details[7].
Recommended for Malvern homes
How it works
- Analysis: your free ZIP report and quiz, or a free in-home test (always, for wells).
- Recommendation: a system matched to your results.
- Price: shown only after the analysis.
- Install: buy on your own or talk it through first.
Check your water in Malvern
Look up what your local water utility has reported to the EPA, then take a 60-second quiz about what you see, taste, and smell at home. We'll use both to recommend the right solution.
Get your water report
Enter your ZIP code to see your utility's violations, lead testing, and PFAS results from public EPA records, explained in plain English.
Data comes from U.S. EPA and Census public records. It covers public water systems, not private wells, and it isn't a test of your home's tap. If you're on a well, a free in-home test is the best way to know what's in your water.
Water self-check quiz
Question 1 of 8Step 2
Your recommended solution
Based on your water report and quiz answers.
Malvern water questions
Are most Malvern homes on wells?
Many are. About 65% of the 19355 ZIP's land area is outside mapped public water service areas. The borough and denser neighborhoods are mostly on Aqua Pennsylvania.
Should I test my Malvern well for radon?
Yes. 14% of USGS-sampled Pennsylvania wells exceeded 4,000 pCi/L. Use a certified lab.
What does Aqua's PFAS level mean for me?
It's above the federal limit that takes effect in 2029, not a current violation. If you'd like to reduce it now, reverse osmosis at the kitchen sink is a common choice.
Book a free water test in Malvern
Sources
- U.S. EPA: SDWIS Federal Reports (violations, lead and copper results). sdwis.epa.gov/ords/sfdw_pub/r/sfdw/sdwis_fed_reports_public/200
- U.S. EPA: UCMR occurrence data. www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule
- Penn State AASL: Chester County drinking water test summary. agsci.psu.edu/aasl/water-testing/drinking-water-testing/drinking-water-test-summaries/chester
- Penn State Extension: Corrosive water problems. extension.psu.edu/corrosive-water-problems
- USGS: High levels of radon found in some wells across Pennsylvania. www.usgs.gov/news/state-news-release/high-levels-radon-found-some-wells-across-pennsylvania
- U.S. EPA: Basic information about lead in drinking water. www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water
- U.S. EPA: Consumer Confidence Reports (CCR) information for consumers. www.epa.gov/ccr/ccr-information-consumers
EPA records retrieved Oct 2026 from the EPA SDWIS and UCMR 5 public datasets. Utility records describe a water system, not the tap in your home. Records can lag and may be incomplete.