The Water Survey is the only state or federal agency in Illinois that maintains a statewide observation well water-level monitoring program. Historical data on 127 inactive observation wells are also available. Ground-water levels in the remaining wells are measured monthly. Hlinka Ground Water Information Requests Program staff respond to requests for information and technical assistance pertaining to ground-water resource availability and quality, water well design, potential yields of wells, and hydraulic properties of regional aquifers in the state. Various individuals and agencies make informational requests.
Responses take the form of telephone calls, letters, and written reports.
Program staff maintain extensive files of well records, well and aquifer production tests, water quality analyses, and file reports. Terms of use. Email the Web Administrator with questions or comments.