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Counties → South Dakota

Custer County, South Dakota

SDWIS compliance plate

Sheet SD033 · Custer County 51 sys · 2,359 viol · #2141/3254

VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · ABOVE-PEER · PFAS-NONE · SRC-GW · SYS-MID · BOOK-MOST

  • VIOL-SEVERE 64.7% flagged
  • HEALTH-LOW 15.2% health
  • RANK-LOWER #2141/3254
  • ABOVE-PEER +14.7 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 100%
  • SYS-MID 51 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Shannon County ( -14.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Custer County ranks #2,141 of 3,254 counties by people served, and #17 of 65 counties in South Dakota. See methodology · corpus placement.

Custer County standing, lower-flagged corpus third

Flagged-system rate 64.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 15.2% is health-based share in the middle third (≤ 24.5%) . No UCMR5 tests in this extract for Custer County . Population served ranks #2,141 of 3,254 · #17 of 65 in South Dakota.

Flagged-rate neighbourhood around Custer County

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

0% 20% 40% 60% 80% 100% Shannon · lowest Lake · near Edmunds · near 50% 64.7% 80% 86.3% 87.5% 100%

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

Water Systems

System Name Population Violations PFAS
Laughing Water Restaurant at Crazy H 2,055 81 -
Custer 1,919 112 -
Nps-Wind Cave National Park 1,404 11 -
Csp-Sylvan Lake 799 0 -
Csp-Game Lodge 541 0 -
Black Hawk Oil Company 500 22 -
Southern Black Hills Water 492 0 -
Hermosa-Old System 420 37 -
Csp-Blue Bell 413 0 -
Heartland Campground 395 28 -
Beaver Lake Campground 300 56 -
Csp-Bison Center 300 0 -
Csp-Wildlife Station Vc 297 0 -
Csp-Legion Lake 278 0 -
Csp-Center Lake & Playhouse 230 0 -
Nps-Jewel Cave National Monument 219 3 -
Spring Creek Acres 172 64 -
Custers Gulch RV Park-#1Sw 150 3 -
Custer-Mount Rushmore KOA-Rear/Cg 146 108 -
Custers Gulch RV Park-#2Ne 129 0 -
Buffalo Gap 126 514 -
Hermosa Water Users Association 108 102 -
Spokane Creek Cabins & Campground 100 17 -
Big Pine Campground 96 9 -
Heartland Country Ranchettes 95 2 -
Broken Arrow Horse Camp 92 20 -
Fort Welikit Family Campground 87 6 -
Csp-Stockade Lake Cg-South 83 0 -
Timber Ridge Campground 83 0 -
Battle Creek Camping Resort 79 1 -
Rock Ridge Court 74 607 -
Custer Mountain Campground 72 64 -
Fairburn Water Association 65 109 -
Csp-French Creek Horse Camp 61 15 -
Pringle 60 159 -
Usfs-Bhnf Bismark Lake Campground 57 24 -
Usfs-Bhnf Comanche Park Campground 55 21 -
Csp-Park Shop 50 0 -
Camp Bob Marshall 50 27 -
Csp-Hidden Valley 45 71 -
Csp-Stockade Lake Cg-North 44 0 -
Four Mile Old West Town 43 0 -
North Hermosa Wud 40 3 -
Paramount Point 40 0 -
Gold Valley Camp 39 29 -
Outlaw Ranch 35 7 -
Roost Resort - East Well 30 0 -
Calamity Peak Lodge 28 25 -
Roost Resort - Campground Well 25 2 -
Custer-Mount Rushmore KOA-Front/Offi 25 0 -

Compare beyond South Dakota

Lower-flagged peers for Custer County

Cross-state counties nearest Custer County on flagged-system share (64.7%) and cumulative violation count (2,359). 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.