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Counties → Washington

Whatcom County, Washington

SDWIS compliance plate

Sheet WA073 · Whatcom County 185 sys · 11,873 viol · #269/3254

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

  • VIOL-SEVERE 95.1% flagged
  • HEALTH-LOW 12.5% health
  • RANK-TOP #269/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-LOW 10.0% detect
  • SRC-GW GW lead 88%
  • SYS-LARGE 185 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Clallam County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Whatcom County ranks #269 of 3,254 counties by people served, and #10 of 39 counties in Washington. See methodology · corpus placement.

Whatcom County standing, mid-flagged corpus third

Flagged-system rate 95.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.5% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 10.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #269 of 3,254 · #10 of 39 in Washington.

Flagged-rate neighbourhood around Whatcom County

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

0% 20% 40% 60% 80% 100% Grant · lowest Klickitat · near Thurston · near Wahkiakum · highest 69.8% 94.3% 94.5% 95% 95% 95.1% 100%

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

Water Systems

System Name Population Violations PFAS
Bellingham-Water Division City Of 139,912 18 Clean
Ferndale 19,305 20 Clean
Lynden Water Department 17,969 33 Clean
Lwwsd - South Shore Water System 10,028 107 Clean
Birch Bay Water & Sewer District 9,019 64 Clean
Blaine City Of 6,319 141 Clean
Everson City Of 3,788 45 Clean
Columbia Valley Water District 2,648 39 Clean
Nooksack Water Dept 2,427 32 -
Glacier Water District 2,383 14 -
Sandy Point Improvement Co 2,098 399 -
Deer Creek Water Assoc. 2,000 15 -
Glenhaven Lakes Club 1,780 18 -
Sumas Water Dept 1,740 77 -
Pole Road Water Association 1,545 116 -
Mt Baker Ski Area - White Salmon 1,501 2 -
Point Roberts Water District No 4 1,440 26 -
Whatcom County Water Dist #7 1,410 3 -
Whatcom County Water Dist #2 1,353 3 -
Nooksack Valley Water Association 1,343 16 -
Birch Bay Square Water Operation 915 40 -
Meridian School Complex 900 24 -
Newhalem Campground & Visitor Ctr 800 1 -
Whatcom County Water Dist 13 795 259 Clean
Mount Baker School District-Deming 700 27 -
Glen Community Association 623 43 -
Sumas Rural Water Association 612 80 -
Meadowbrook Water Association 579 36 -
Acme Water District No 18 568 35 -
Silver Lake Park - Main Campground 553 20 -
Old Settlers Water Association 540 39 -
Deming Water Assoc. 501 21 -
Mount Baker Water Association 500 202 -
Louie Joe Water Association 471 23 -
Delta Water Association 450 492 -
Panorama Point Campground 450 10 -
Skookum Chuck Water Association 415 304 -
Berthusen Road Water Association 409 22 -
Deming Log Show & RV 407 27 -
Colonial Creek Campground 407 0 -
Mt Baker Ski Area Heather Meadows 405 9 -
Grandview-Northgate Industrial Park 400 7 -
Kendall Elementary School 400 22 -
Northwest Water Assoc. Inc. 400 221 Detected
Whatcom Meadows 370 15 -
Custer Water Association 365 77 -
Lisecc 357 40 -
Bell Bay Jackson Water Association 350 26 -
Harmony Grade School 325 44 -
Phillips 66 Company 288 8 -

Compare beyond Washington

Mid-flagged peers for Whatcom County

Cross-state counties nearest Whatcom County on flagged-system share (95.1%) and cumulative violation count (11,873). 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.