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Counties → Wyoming

Natrona County, Wyoming

SDWIS compliance plate

Sheet WY025 · Natrona County 48 sys · 2,056 viol · #675/3254

VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · ABOVE-PEER · PFAS-CLEAN · SRC-SW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 97.9% flagged
  • HEALTH-LOW 6.5% health
  • RANK-UPPER #675/3254
  • ABOVE-PEER +1.6 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-SW SW lead 50%
  • SYS-MID 48 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Crook County ( -1.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Natrona County ranks #675 of 3,254 counties by people served, and #2 of 23 counties in Wyoming. See methodology · corpus placement.

Natrona County standing, mid-flagged corpus third

Flagged-system rate 97.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.5% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #675 of 3,254 · #2 of 23 in Wyoming.

Flagged-rate neighbourhood around Natrona County

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

0% 20% 40% 60% 80% 100% Teton · lowest Crook · near Niobrara · highest Uinta · near 87.1% 95.8% 96.3% 97.9% 100% 100% 100%

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

Water Systems

System Name Population Violations PFAS
Casper, City Of 59,000 3 Clean
Mills, City Of 4,050 12 Clean
Bar Nunn, Town Of 4,000 16 Clean
Evansville, Town Of 2,728 7 -
Vista West Water Company 1,600 20 -
Pioneer Water & Sewer District 1,500 16 -
Alcova Lake Park Trailer Village 800 10 -
Mhvc Visitors Center 612 4 -
Hogadon Ski Area 504 17 -
Midwest, Town Of 410 34 -
Natrona County Int'l Airport 375 15 -
WY DOT-Independence Ra 350 5 -
Terrace I Mhc 336 2 -
Riverside Mobile Home Court 330 10 -
Hidden Hills MHP 324 6 -
Terrace II Mhc 320 0 -
WY Trans Dept Waltman Ra 300 7 -
Green Valley MHP 265 3 -
Air Base Acres I&s District 236 21 -
Mhvc Cherry Creek Cg 202 5 -
Poison Spider I&s District 200 72 -
Mills Spring Ranch 200 63 -
Thirty-Three Mile Road I&s District 200 6 -
Edgerton, Town Of 195 25 -
Sandy Lake Estates I&s District 150 12 -
Mountain Top Baptist Assembly 150 19 -
Pleasant View Water Company 130 6 -
Natrona County Parks-Trails Center 130 12 -
Countryside Court 125 301 -
South Riverside Acres Wtr Impr Dist 125 31 -
Camp Wyoba and Lions Club 105 44 -
Mhvc 66 Ranch 96 6 -
Sloanes General Store 90 17 -
Camp Sacajawea 79 40 -
Lord of Lords Lutheran Church 70 18 -
Lakeview I&s District 62 17 -
Mhvc Jackson Cg 50 2 -
Alcova Lakeview Estates I 50 1 -
Mile-HI I&s District 48 9 -
Sunset Grill & River View Inn 39 38 -
Eagle Creek RV Park 33 29 -
Broken Wrench LLC 30 308 -
Alcova Dam RV Park 30 732 -
Central WY Regional Water System Jpb 25 6 -
Ekw State Park-Platte River Ra 25 5 -
Ekw State Park-Cottonwood 25 4 -
Blm Lodgepole Campground 25 12 -
Alcova Lakeview Estates II 9 8 -

Compare beyond Wyoming

Mid-flagged peers for Natrona County

Cross-state counties nearest Natrona County on flagged-system share (97.9%) and cumulative violation count (2,056). 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.