Community Water System · PWS IL0990200
Grand Ridge
Operator location Grand Ridge, Illinois - 50% of 355 violations are health-based (upper-third health share (> 23%)); groundwater source; 515 served per SDWIS.
- 515
- People served (this PWS)
- 355
- EPA violations (this PWS)
- 176
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Grand Ridge standing, high SDWIS violation third
50% of 355 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 50% is upper-third health share (> 23%). Population rank #28,258 of 29,740 among systems serving 500+.
The verdict
Grand Ridge sits in the upper third of the sitemap cohort by violation count (355), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (515; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 50% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #28,258 of 29,740
- Population · /systems
- #1,245 of 1,310
- Population · IL
- 355
- Total EPA violations on record
- 50%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 249
- County
- LaSalle
- School/Daycare
- No
- MCL Violations
- 176
- Monitoring Violations
- 153
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 170 | 2019 |
| Public Notice | Other | 10 | 2017 |
| Arsenic | MR | 8 | 2017 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2023 |
| TTHM | MR | 8 | 2023 |
| TTHM | MCL | 6 | 2017 |
| BHC-GAMMA | MR | 4 | 2012 |
| Endothall | MR | 4 | 2012 |
| OXAMYL | MR | 4 | 2012 |
| Simazine | MR | 4 | 2012 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2012 |
| Picloram | MR | 4 | 2012 |
| Dinoseb | MR | 4 | 2012 |
| Aldicarb sulfoxide | MR | 4 | 2012 |
| Carbofuran | MR | 4 | 2012 |
| Atrazine | MR | 4 | 2012 |
| HEXACHLOROBENZENE | MR | 4 | 2012 |
| Pentachlorophenol | MR | 4 | 2012 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2012 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2012 |
| ETHYLENE DIBROMIDE | MR | 4 | 2012 |
| Chlordane | MR | 4 | 2012 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2025 |
| Benzo(a)pyrene | MR | 4 | 2012 |
| Dalapon | MR | 4 | 2012 |
| Heptachlor | MR | 4 | 2012 |
| Aldicarb | MR | 4 | 2012 |
| Endrin | MR | 4 | 2012 |
| Toxaphene | MR | 4 | 2012 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2012 |
Violation Count vs. the National Corpus
Grand Ridge has 355 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 50% of this system's own violations are health-based (176 of 355), and it ranks #28,258 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
355 Higher than most more violations than 93% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Grand Ridge
176 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IL0990200.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
355 violations · 515 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Grand Ridge
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Illinois compares on the same EPA violation measures. Illinois systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.