Monroe County, Illinois
SDWIS compliance plate
Sheet IL133 · Monroe County 17 sys · 733 viol · #1462/3254
VIOL-SEVERE · HEALTH-MID · RANK-MID · ABOVE-PEER · PFAS-HIGH · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 64.7% flagged
- HEALTH-MID 20.3% health
- RANK-MID #1462/3254
- ABOVE-PEER +3.6 pp
- PFAS-HIGH 50.0% detect
- SRC-GW GW lead 76%
- SYS-SMALL 17 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: St. Clair County ( -3.6 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Monroe County ranks #1,462 of 3,254 counties by people served, and #48 of 102 counties in Illinois. See methodology · corpus placement.
Monroe 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 20.3% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,462 of 3,254 · #48 of 102 in Illinois.
Flagged-rate neighbourhood around Monroe County
Lowest/highest poles plus in-state counties nearest Monroe County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Columbia | 11,129 | 6 | Detected |
| Waterloo | 10,190 | 116 | Detected |
| Fountain Water District | 3,650 | 26 | Clean |
| Valmeyer | 1,263 | 62 | Clean |
| Hecker | 429 | 51 | - |
| Maeystown | 340 | 177 | - |
| Hank and Lillys Fountain Inn LLC | 50 | 0 | - |
| Career Center of Southern Illinois | 50 | 275 | - |
| Waterloo Sportsman Club D Rahn | 40 | 3 | - |
| Ice House Waterloo | 40 | 0 | - |
| Walmart (138339) | 25 | 0 | - |
| Schnucks #242 | 25 | 0 | - |
| Schnucks 244 Columbia | 25 | 0 | - |
| Freedom Lake | 25 | 6 | - |
| M & B Ice Columbia | 25 | 0 | - |
| Sugar Spring Ranch Banquet | 25 | 4 | - |
| Midwest Petroleum Co. Ph 66 | 25 | 7 | - |
Compare beyond Illinois
Lower-flagged peers for Monroe County
Cross-state counties nearest Monroe County on flagged-system share (64.7%) and cumulative violation count (733). 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.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
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.