What's in PATTISON 500's water?

PATTISON 500 has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 4,643 people through 1,865 service connections.

PATTISON 500's record against the rest of the country

Out of 12,903 systems in this dataset, PATTISON 500 ranks 4,073th by violation burden (68th percentile) - 36 violations total, 4 health-baseds.

How PATTISON 500 compares within WA

PATTISON 500's 4 health-based violations sit above the WA average of 3.7, across 322 systems statewide. The clean-record guide covers what a comparison like this can hide.

Most recent violation on record

The last violation EPA has on record for PATTISON 500 is from 2012-01-07 (health-based: 1998-01-05). Last reported to EPA: 06/19/2026.

What kind of problem, specifically

PATTISON 500'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)

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

PATTISON 500'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. Between the utility's meter and PATTISON 500's customers' taps is household plumbing, invisible to a system-level record ranked 4,073th of 12,903 by violation count. The guide to what this data misses covers that gap.