Non-Transient Non-Community Water System · PWS IL3163188
US Silica Ottawa South Pit
Operator location Ottawa, Illinois - 0% of 144 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 35 served per SDWIS.
- 35
- People served (this PWS)
- 144
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
US Silica Ottawa South Pit standing, high SDWIS violation third
0% of 144 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%).
The verdict
US Silica Ottawa South Pit sits in the upper third of the sitemap cohort by violation count (144), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (35; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- 144
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 35
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 1
- County
- LaSalle
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 144
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Methoxychlor | MR | 4 | 2022 |
| Carbofuran | MR | 4 | 2022 |
| Atrazine | MR | 4 | 2022 |
| Heptachlor | MR | 4 | 2022 |
| Heptachlor epoxide | MR | 4 | 2022 |
| 2,4-D | MR | 4 | 2022 |
| 2,4,5-TP | MR | 4 | 2022 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2022 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2022 |
| ETHYLENE DIBROMIDE | MR | 4 | 2022 |
| p-Dichlorobenzene | MR | 4 | 2022 |
| 1,1,1-Trichloroethane | MR | 4 | 2022 |
| 1,2-Dichloropropane | MR | 4 | 2022 |
| Trichloroethylene | MR | 4 | 2022 |
| Benzene | MR | 4 | 2022 |
| Toluene | MR | 4 | 2022 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2022 |
| Xylenes, Total | MR | 4 | 2022 |
| o-Dichlorobenzene | MR | 4 | 2022 |
| trans-1,2-Dichloroethylene | MR | 4 | 2022 |
| 1,2-Dichloroethane | MR | 4 | 2022 |
| Tetrachloroethylene | MR | 4 | 2022 |
| CHLOROBENZENE | MR | 4 | 2022 |
| Ethylbenzene | MR | 4 | 2022 |
| Styrene | MR | 4 | 2022 |
| Toxaphene | MR | 4 | 2022 |
| LASSO | MR | 4 | 2022 |
| Pentachlorophenol | MR | 4 | 2022 |
| BHC-GAMMA | MR | 4 | 2022 |
| DICHLOROMETHANE | MR | 4 | 2022 |
Violation Count vs. the National Corpus
US Silica Ottawa South Pit has 144 recorded EPA violations, 80% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 20% carry more. 0% of this system's own violations are health-based (0 of 144), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
144 Higher than most more violations than 80% 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 US Silica Ottawa South Pit
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for IL3163188.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
144 violations · 35 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.
What to do with US Silica Ottawa South Pit
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.