Mason County, Illinois
SDWIS compliance plate
Sheet IL125 · Mason County 26 sys · 710 viol · #2429/3254
VIOL-SEVERE · HEALTH-MID · RANK-LOWER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 96.2% flagged
- HEALTH-MID 23.9% health
- RANK-LOWER #2429/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-CLEAN 0.0% detect
- SRC-GW GW lead 100%
- SYS-SMALL 26 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Williamson County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Mason County ranks #2,429 of 3,254 counties by people served, and #87 of 102 counties in Illinois. See methodology · corpus placement.
Mason County standing, mid-flagged corpus third
Flagged-system rate 96.2% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 23.9% is health-based share in the middle 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 #2,429 of 3,254 · #87 of 102 in Illinois.
Flagged-rate neighbourhood around Mason County
Lowest/highest poles plus in-state counties nearest Mason County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Havana | 2,963 | 15 | Clean |
| Mason City | 2,558 | 91 | - |
| Manito | 1,552 | 64 | - |
| San Jose | 479 | 30 | - |
| Easton | 334 | 13 | - |
| Lost Arrow Campominium | 223 | 19 | - |
| Forest City | 222 | 23 | - |
| St Pauls Luthern Church | 150 | 16 | - |
| One More Inc. | 100 | 13 | - |
| Mad Jacks Inc | 75 | 36 | - |
| Hialeah Club | 60 | 29 | - |
| Mason State Tree Nursery | 40 | 1 | - |
| Sand Ridge State Forest (117515) | 40 | 6 | - |
| Evening Star Camping Resort | 30 | 3 | - |
| Evening Star Camping Resort(3608) | 25 | 83 | - |
| Sand Ridge State Forest Head Qtr #1 | 25 | 39 | - |
| Evening Star Camping Resort (4150) | 25 | 22 | - |
| Sand Ridge State Forest Pine Camp #2 | 25 | 34 | - |
| Jake Wolf Fish Hatchery | 25 | 3 | - |
| Sabina's Mexican Bar and Restaurant | 25 | 62 | - |
| Four Willows Golf Course | 25 | 19 | - |
| Havana County Market | 25 | 3 | - |
| Evening Star Camping Resort (150201) | 25 | 60 | - |
| Iga Mason City Market | 25 | 0 | - |
| Just Chillin' Ice & Water Havana | 25 | 6 | - |
| Dollar General Store #21266 | 25 | 20 | - |
Compare beyond Illinois
Mid-flagged peers for Mason County
Cross-state counties nearest Mason County on flagged-system share (96.2%) and cumulative violation count (710). 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.