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Counties → Illinois

Stephenson County, Illinois

SDWIS compliance plate

Sheet IL177 · Stephenson County 47 sys · 3,740 viol · #1236/3254

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

  • VIOL-SEVERE 89.4% flagged
  • HEALTH-LOW 5.6% health
  • RANK-UPPER #1236/3254
  • PHOTO-FINISH ±0.5 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 100%
  • SYS-MID 47 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Knox County ( -0.5 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Stephenson County ranks #1,236 of 3,254 counties by people served, and #37 of 102 counties in Illinois. See methodology · corpus placement.

Stephenson County standing, lower-flagged corpus third

Flagged-system rate 89.4% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 5.6% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,236 of 3,254 · #37 of 102 in Illinois.

Flagged-rate neighbourhood around Stephenson County

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

0% 20% 40% 60% 80% 100% Sangamon · lowest Marion · near Fulton · near Pulaski · highest 58.8% 88.9% 88.9% 88.9% 88.9% 89.4% 100%

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

Water Systems

System Name Population Violations PFAS
Freeport 23,930 3 Detected
Lena 2,680 73 -
Pearl City 790 348 -
Orangeville 780 19 -
Cedarville 663 19 -
Prairie Path Water Company-Northern Hill 600 31 -
Davis 589 39 -
Dakota 500 18 -
German Valley 463 52 -
Titan Tire Coorporation of Freeport 400 118 -
Winslow 350 130 -
Rock City 313 20 -
Freeport P D Oakdale Nature Preserve 250 0 -
Emerald Acres Campground II North 200 16 -
Berner Food and Beverage LLC 200 658 -
Timber Ridge Mobile Estates 150 164 -
IN Grown Farms 2 LLC 133 567 -
Stephenson Mobile Estates 128 230 -
Freeport Cc 115 6 -
Lena KOA - Office/South Sites 100 12 -
Emerald Acres Campground II South 100 10 -
Route 20 Bar and Grill 100 2 -
The Ville Golf 100 4 -
Nuestro Queso - Exterior Well 91 43 -
Nuestro Queso - Interior Well 91 16 -
Cedar Inn 50 2 -
Core Fx Ingredients 45 230 -
The Rafters 35 3 -
Sullivans (0144139) 35 0 -
Cub Foods #30914 #1 1-85582Lr 35 0 -
Sullivans (147140) 35 0 -
Devansoy Inc 32 65 -
Wayside Saloon 30 5 -
Benchwarmers East 30 4 -
Ridott Corners Tap 29 20 -
Wolf Hollow Golf Course 29 11 -
Big O'S on the Hollow 27 6 -
Freeport Mennonite Church 27 2 -
Cedarville Baptist Church 27 2 -
Lake Le Aqua Na St Park-Pine Ridge Cg 25 12 -
Lake Le Aqua Na St Park-Hickory Hill 25 4 -
Lake Le Aqua Na St Park-Big Buck Hp 25 4 -
Pearl Valley Farms 25 754 -
Lena KOA - Northwest Well 25 7 -
South Street Slots 25 7 -
Lloyd G Smith Plaza 25 0 -
Lucky Pines Pub House and Game 25 4 -

Compare beyond Illinois

Lower-flagged peers for Stephenson County

Cross-state counties nearest Stephenson County on flagged-system share (89.4%) and cumulative violation count (3,740). 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.