The Illinois State Water Survey (ISWS) currently has real-time monitoring for following groundwater observation wells:
- MTOW-02 – Easton
- MTOW-03 – Wildlife Refuge
- MTOW-04 – Sand Ridge
- MTOW-06 – Tree Nursery
- MTOW-07 – IL RT-136
- MTOW-08 – Green Valley
- MTOW-10 – San Jose
- MTOW-11 – Mason City (Glasford Formation)
- MTOW-12 – Hahn Farm
- MTOW-13 – Talbot Tree Farm
- MTOW-14 – Mason City (Banner Formation)
- MTOW-15A – Ellsberry Lake
- MTOW-16 – Sand Lake
- MTOW-17 – Biggs
- MTOW-18 – Robinson
Source: Imperial Valley Groundwater Monitoring Webpage (Illinois State Water Survey)
Past Hydrographs for wells with no real-time monitoring:
