What's in NORTHWESTERN LANCASTER CO AUTH's water?
NORTHWESTERN LANCASTER CO AUTH has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 2,968 people through 844 service connections.
NORTHWESTERN LANCASTER CO AUTH's record against the rest of the country
NORTHWESTERN LANCASTER CO AUTH has 82 violations on record in total, 12 of thems health-based - ranking it 1,554th of 12,903 systems by violation count, the 88th percentile nationally.
How NORTHWESTERN LANCASTER CO AUTH compares within PA
Among the 475 PA systems in this dataset, the average is 5.5 health-based violations - NORTHWESTERN LANCASTER CO AUTH's 12 is above that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for NORTHWESTERN LANCASTER CO AUTH is from 2026-01-01 (health-based: 2011-01-04). Last reported to EPA: 06/15/2026.
What kind of problem, specifically
NORTHWESTERN LANCASTER CO AUTH'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:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
- Nitrate / nitrite - flagged from: Nitrate
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
Everything on this page is NORTHWESTERN LANCASTER CO AUTH's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 82 logged violations can see. The guide to what this data misses covers that gap.