Public water system
O Fallon
PWSID IL1631100 - St. Clair County, Illinois
399 PPM
23.3 GPG
Very Hard0Soft60120180300+
Very Hard (399 PPM)High Confidence - USGS Monitoring
System Details
- Water source
- surface water
- Population served
- 46,603
- Service connections
- 18,497
- Status
- Active
Hardness Evidence
- Reported hardness
- 399 PPM
- Grains per gallon
- 23.3 GPG
- Data source
- USGS monitoring
- Source year
- N/A
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 62059 | Lovejoy, IL | Very Hard (270 PPM) |
| 62201 | Sauget, IL | Very Hard (270 PPM) |
| 62203 | East Saint Louis, IL | Very Hard (270 PPM) |
| 62204 | Washington Park, IL | Very Hard (270 PPM) |
| 62205 | East Saint Louis, IL | Very Hard (270 PPM) |
| 62206 | Cahokia, IL | Very Hard (270 PPM) |
| 62207 | Alorton, IL | Very Hard (270 PPM) |
| 62208 | Fairview Heights, IL | Very Hard (270 PPM) |
| 62220 | Belleville, IL | Very Hard (270 PPM) |
| 62221 | Belleville, IL | Very Hard (270 PPM) |
| 62223 | Belleville, IL | Very Hard (270 PPM) |
| 62225 | Scott A F B, IL | Very Hard (268 PPM) |
| 62226 | Belleville, IL | Very Hard (271 PPM) |
| 62232 | Caseyville, IL | Very Hard (270 PPM) |
| 62239 | Dupo, IL | Very Hard (273 PPM) |
| 62240 | East Carondelet, IL | Very Hard (270 PPM) |
| 62243 | Freeburg, IL | Very Hard (273 PPM) |
| 62254 | Lebanon, IL | Very Hard (269 PPM) |
| 62255 | Lenzburg, IL | Very Hard (270 PPM) |
| 62257 | Marissa, IL | Very Hard (271 PPM) |
| 62258 | Mascoutah, IL | Very Hard (268 PPM) |
| 62260 | Millstadt, IL | Very Hard (273 PPM) |
| 62264 | New Athens, IL | Very Hard (269 PPM) |
| 62269 | Shiloh, IL | Very Hard (270 PPM) |
| 62285 | Smithton, IL | Very Hard (272 PPM) |
| 62289 | Summerfield, IL | Very Hard (270 PPM) |
How to Use This System Page
A public water system can serve multiple ZIP codes and cities. Use this page to inspect the source behind the hardness reading, then open the linked ZIP or city page for the local rollup.
If you are sizing treatment equipment, confirm your actual tap hardness with a home test or lab test before buying.