What's in SAMMAMISH PLATEAU WATER & SEWER's water?
SAMMAMISH PLATEAU WATER & SEWER has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 79,362 people through 24,792 service connections.
SAMMAMISH PLATEAU WATER & SEWER's record against the rest of the country
54 total violations and 3 health-based ones put SAMMAMISH PLATEAU WATER & SEWER at the 63th percentile nationally for violation burden, rank 4,795 of 12,903.
How SAMMAMISH PLATEAU WATER & SEWER compares within WA
Among the 322 WA systems in this dataset, the average is 3.7 health-based violations - SAMMAMISH PLATEAU WATER & SEWER's 3 is at or below 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 SAMMAMISH PLATEAU WATER & SEWER is from 2009-01-01 (health-based: 2004-01-01). Last reported to EPA: 06/19/2026.
What kind of problem, specifically
SAMMAMISH PLATEAU WATER & SEWER'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
SAMMAMISH PLATEAU WATER & SEWER'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 SAMMAMISH PLATEAU WATER & SEWER's customers' taps is household plumbing, invisible to a system-level record ranked 4,795th of 12,903 by violation count. The guide to what this data misses covers that gap.