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Counties → Washington

Clark County, Washington

SDWIS compliance plate

Sheet WA011 · Clark County 72 sys · 9,864 viol · #115/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 93.1% flagged
  • HEALTH-LOW 2.3% health
  • RANK-TOP #115/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 80.0% detect
  • SRC-GW GW lead 99%
  • SYS-MID 72 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Chelan County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Clark County ranks #115 of 3,254 counties by people served, and #5 of 39 counties in Washington. See methodology · corpus placement.

Clark County standing, mid-flagged corpus third

Flagged-system rate 93.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 2.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 80.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #115 of 3,254 · #5 of 39 in Washington.

Flagged-rate neighbourhood around Clark County

Lowest/highest poles plus in-state counties nearest Clark County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Grant · lowest Clark · this county Pend Oreille · near Wahkiakum · highest 69.8% 92.8% 93.1% 93.2% 93.2% 93.5% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Vancouver City Of 373,047 49 Detected
Clark Public Utilities 116,876 69 Detected
Camas Municipal Water Sewer System 31,794 714 Detected
Battle Ground Water Dept City Of 29,974 911 -
Washougal City Of 21,441 335 Detected
Ridgefield Public Works 20,967 1,376 Clean
Yacolt 3,034 80 -
Battle Ground High and Lewisville E 2,835 15 -
Bi Zi Farms 1,328 4 -
Battle Ground State Park 1,290 22 -
Paradise Point State Park 1,114 23 -
Amboy Clark Public Utilities 991 30 -
Lewisville Park 875 12 -
Lake Merwin Campers Hideaway Sys 1 820 497 -
Larch Corrections Center 705 366 -
Washougal Motocross LLC 602 26 -
Club Green Meadows 545 5 -
Glenwood Little League 500 60 -
Vancouver Lake Park 500 6 -
Country Manor Mobile Home Park 450 23 -
Chelatchie Prairie General Store 407 12 -
Lake Merwin Campers Hideaway Sys 2 401 30 -
Vista del Rio Mobile Home Park 352 3,450 -
Harmony Sports 333 15 -
Port of Vancouver 317 32 -
Fargher Lake Grocery 275 31 -
Royal Ridges Retreat Lower Camp 257 12 -
Great Western Mobile Home Park 250 75 -
Oak Meadows Mobile Home Park 216 142 -
Woodland Mhc LLC 209 12 -
Green Mountain School 200 138 -
Currie Jd Youth Camp 200 3 -
Lake Merwin Campers Hideaway Sys 3 164 18 -
Alderbrook Park 150 16 -
Fern Prairie Market 135 9 -
Camp Hope 133 1 -
Bethany Vineyards 130 24 -
Fargher Lake Restaurant 121 3 -
Creekside Country Store 104 16 -
Clark County Saddle Club 103 21 -
Lucia Falls Park 102 2 -
Hillcrest Manor 100 32 -
Brookside 100 161 -
Mt St Helens National Volcanic Monu 95 32 -
Single Tree Acres 90 229 -
The Matson Building 81 24 -
Green Mountain Mobile Ranch 80 20 -
Cedar Creek SDA Church 80 24 -
Morning Meadows 75 7 -
Vanridge Mobile Home Park 71 257 -

Compare beyond Washington

Mid-flagged peers for Clark County

Cross-state counties nearest Clark County on flagged-system share (93.1%) and cumulative violation count (9,864). 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.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

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.