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Counties → Idaho

Madison County, Idaho

SDWIS compliance plate

Sheet ID065 · Madison County 33 sys · 998 viol · #950/3254

VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 93.9% flagged
  • HEALTH-MID 29.9% health
  • RANK-UPPER #950/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 100%
  • SYS-SMALL 33 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Gem County (+ 0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Madison County ranks #950 of 3,254 counties by people served, and #7 of 44 counties in Idaho. See methodology · corpus placement.

Madison County standing, mid-flagged corpus third

Flagged-system rate 93.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 29.9% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #950 of 3,254 · #7 of 44 in Idaho.

Flagged-rate neighbourhood around Madison County

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

0% 20% 40% 60% 80% 100% Valley · lowest Benewah · near Gem · near Camas · highest 89.5% 93.2% 93.3% 93.9% 94.1% 94.4% 100%

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

Water Systems

System Name Population Violations PFAS
Rexburg City Of 40,462 116 Clean
Sugar City City Of 2,395 25 -
Henrys Fork Lds Church 747 0 -
South Rexburg Stake Center 737 0 -
Salem Lds Church 581 10 -
Yellowstone Bear World 500 13 -
Plano Lds Church 479 7 -
Hibbard Lds Church 472 7 -
Lyman Lds Mtghs 471 8 -
Burton Lds Mtghs 451 10 -
Archer Lds Mtghs 450 16 -
South Fork Elementary School 359 18 -
Hibbard Elementary 300 32 -
Cedar Butte Subdivision 300 14 -
Liberty Estates 300 28 -
The Occasions Group 202 9 -
Dickinson Frozen Foods 190 7 -
Basic American Foods Rexburg 150 16 -
Green Canyon Hot Springs 100 45 -
Byu-Idaho Livestock Center 100 14 -
Sun Glo of Idaho North 92 25 -
Ups - Rexburg (Idrex) 80 2 -
White Sparrow Country Store 55 6 -
Hillview Subd 50 91 -
Mother Hibbards 50 61 -
Big Juds Well 50 27 -
Meadow Lark Court LLC 45 220 -
Syringa Park Subd 35 30 -
Wakeside Lake RV Park 30 62 -
Mountain West Products 30 26 -
Sugar RV Park 30 4 -
Taqueria El Rancho 25 25 -
Snake River Hideout 25 24 -

Compare beyond Idaho

Mid-flagged peers for Madison County

Cross-state counties nearest Madison County on flagged-system share (93.9%) and cumulative violation count (998). 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.