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Counties → Michigan

St. Clair County, Michigan

SDWIS compliance plate

Sheet MI147 · St. Clair County 104 sys · 2,483 viol · #475/3254

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

  • VIOL-SEVERE 92.3% flagged
  • HEALTH-LOW 6.6% health
  • RANK-TOP #475/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 85%
  • SYS-MID 104 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Wexford County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, St. Clair County ranks #475 of 3,254 counties by people served, and #16 of 83 counties in Michigan. See methodology · corpus placement.

St. Clair County standing, lower-flagged corpus third

Flagged-system rate 92.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.6% 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 #475 of 3,254 · #16 of 83 in Michigan.

Flagged-rate neighbourhood around St. Clair County

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

0% 20% 40% 60% 80% 100% Oscoda · lowest Wexford · near St. Clair · this county Menominee · highest 52.9% 91.8% 92% 92% 92.3% 92.8% 100%

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

Water Systems

System Name Population Violations PFAS
Port Huron, City Of 33,800 9 Clean
Fort Gratiot Township 11,616 22 Clean
Port Huron Township 10,654 19 Clean
Marysville, City Of 9,959 234 Clean
Clay Township 9,866 14 Clean
Ira Township 6,510 5 Clean
St. Clair Water and Sewer Authority 5,847 0 Clean
St. Clair, City Of 5,485 25 Clean
Kimball Township 5,170 72 Clean
Marine City 4,652 16 Clean
Algonac, City Of 4,110 134 Clean
St. Clair Township 3,270 14 -
Cottrellville Township 3,200 14 -
Burtchville Township 2,900 24 -
Clyde Township 2,400 5 Clean
Yale, City Of 1,900 43 -
Capac, Village Of 1,775 174 -
Memphis, City Of 1,084 18 -
Pinewood on the Lake MHP 950 15 -
Thousand Trails Campground 904 36 -
Love's Travel Center - St Clair 500 15 -
St. Paul's Lutheran Church - Casco 306 9 -
John Farrell Elementary 300 128 -
Sunrise Conv Store #29 300 16 -
Avoca Elementary School 200 132 -
The Old Club 200 9 -
Camp Hawthorn Hollow 150 7 -
Columbus Bible Church 150 4 -
Perch Point Conservation Club 130 14 -
Sunrise MHP 120 11 -
Goodells Co Park - North 120 9 -
Dorsey House 100 27 -
Goodells Co Park - Svc & Media 100 8 -
Goodells Park - East 100 10 -
Goodells Co Park - Artesian Well 100 11 -
Golden Hawk Golf Course 100 14 -
Solitude Links Golf 100 6 -
Wadhams Oil 100 12 -
Camp Hawthorne Hollow Hand Pump 100 11 -
St. John the Evangelist 100 1 -
Holly Meadows Golf Course 100 4 -
Emmett KOA 100 9 -
Dunrentin Heights Subdivision 81 88 -
Brockway Township Hall 80 27 -
Pine River Nature Center 75 0 -
Scooters Pub 65 60 -
Gleason-Butler-Sharpe VFW 60 10 -
Mdot - Richmond R909 (R910 Closed) 50 11 -
Grump's 50 47 -
Our Lady of Mt. Carmel 50 8 -

Compare beyond Michigan

Lower-flagged peers for St. Clair County

Cross-state counties nearest St. Clair County on flagged-system share (92.3%) and cumulative violation count (2,483). 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.