No health-based violations on EPA record since 2016.
Serves about 9,900 people (3,681 connections) with surface water from its own intake, and buys water from Aqua Pa Uwchlan.
From EPA's record for PA1150026. PurityMap is independent of Downingtown Water Authority.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2024 to October 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 4.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorobutanesulfonic acid (PFBS) | 3.8 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorohexanoic acid (PFHxA) | 3.1 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoropentanoic acid (PFPeA) | 3.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-22 to 2024-10-15 | UCMR5 Analytical Results: DOWNINGTOWN WATER AUTHORITY (PA1150026) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Downingtown Water Authority's phone number on EPA record is 610-269-5362. Its mailing address is 100 WATER PLANT WAY, DOWNINGTOWN, PA 19335.
According to EPA's record, Downingtown Water Authority uses surface water from its own intake, and buys water from Aqua Pa Uwchlan.
No health-based violations on EPA record since 2016. EPA also lists 27 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Downingtown Water Authority's latest lead and copper round, which ended in September 2025, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Downingtown Water Authority. Its phone number on EPA record is 610-269-5362. Its mailing address on EPA record is 100 WATER PLANT WAY, DOWNINGTOWN, PA 19335. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.