What's in CITY OF LANCASTER's water?
CITY OF LANCASTER had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. It serves 120,000 people through 49,376 service connections.
Ranked against every other system in this dataset
CITY OF LANCASTER has 75 violations on record in total, 11 of thems health-based - ranking it 1,710th of 12,903 systems by violation count, the 87th percentile nationally.
How CITY OF LANCASTER compares within PA
Among the 475 PA systems in this dataset, the average is 5.5 health-based violations - CITY OF LANCASTER's 11 is above that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for CITY OF LANCASTER is from 2025-01-05 (health-based: 2024-01-04). Last reported to EPA: 06/15/2026.
What kind of problem, specifically
CITY OF LANCASTER's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Lead & copper - flagged from: Lead and Copper Rule
- Microbial contamination / treatment technique - flagged from: Surface Water Treatment Rule
- Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What this data is and is not
CITY OF LANCASTER's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. This record - 11 health-based violations on file for CITY OF LANCASTER - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.