Cowlitz County, Washington
SDWIS compliance plate
Sheet WA015 · Cowlitz County 76 sys · 13,735 viol · #525/3254
VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-LOW · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 90.8% flagged
- HEALTH-LOW 1.1% health
- RANK-TOP #525/3254
- PHOTO-FINISH ±0.4 pp
- PFAS-LOW 16.7% detect
- SRC-GW GW lead 89%
- SYS-MID 76 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Lincoln County (+ 0.4 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Cowlitz County ranks #525 of 3,254 counties by people served, and #15 of 39 counties in Washington. See methodology · corpus placement.
Cowlitz County standing, lower-flagged corpus third
Flagged-system rate 90.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 1.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 16.7% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #525 of 3,254 · #15 of 39 in Washington.
Flagged-rate neighbourhood around Cowlitz County
Lowest/highest poles plus in-state counties nearest Cowlitz County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Washington
Lower-flagged peers for Cowlitz County
Cross-state counties nearest Cowlitz County on flagged-system share (90.8%) and cumulative violation count (13,735). In-state neighbours stay on the compliance plate above.
Similar flagged-system rate
Nearest cross-state counties by % of SDWIS systems with at least one violation on record.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.