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Updated 2026-10-15
County water report

York County Water Quality: 5 Cities Ranked by the Records

York County, Pennsylvania: 5 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in York County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 1 system of 5 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest43.2 µg/L
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 5 tested4.0 ng/L federal MCL (2024) · US EPAHighest11.1 ng/L
Perfluorooctanoic acid (PFOA)Detected in 1 system of 5 tested4.0 ng/L federal MCL (2024) · US EPAHighest6.3 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 5 tested10 ng/L federal MCL (2024) · US EPAHighest3.3 ng/L
Lead (90th percentile)Detected in 4 systems of 5 tested15 µg/L federal action level · US EPAHighest3 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 5 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.4 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 5 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest4.1 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 2 systems of 5 testedNo federal or state limit; shown for transparencyHighest4.6 ng/L
23 PFAS tested, none detected in any systemShow

Tested in these 5 systems: DALLASTOWN YOE WATER AUTH, HANOVER MUNI WATER WORKS, RED LION MUNICIPAL AUTHORITY, WEST MANCHESTER TWP AUTH, YORK WATER CO

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
5 cities

Cities ranked by the records

Showing 5 of 5 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in York County1 of 5 city reports had a PFAS sample above a 2024 EPA limit
  1. Shiloh11.1 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Pennsylvania
Lead

0of 5 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Pennsylvania
Who supplies the county

Largest water systems

  1. YorkYORK WATER CO · PA7670100
    206,762 served
  2. HanoverHANOVER MUNI WATER WORKS · PA7670076
    40,900 served
  3. Red LionRED LION MUNICIPAL AUTHORITY · PA7670086
    15,882 served
  4. DallastownDALLASTOWN YOE WATER AUTH · PA7670085
    12,300 served
  5. ShilohWEST MANCHESTER TWP AUTH · PA7670101
    9,960 served
Questions

Frequently asked

How does York County tap water compare across cities?

PurityMap ranks 5 cities in York County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Dallastown's main water system: DALLASTOWN YOE WATER AUTH · PWSID PA7670085 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many York County cities had a PFAS sample above a 2024 EPA limit?

1 of 5 York County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Shiloh (PFOS 11.1 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 2.

Is there lead in York County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 5 York County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Have York County water systems had drinking-water violations?

1 city in York County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

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