Public water system record
Cary
Serves Cary and Trout Valley, McHenry County, IL · 17,826 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Cary in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Cary draws water from 9 wells.
- Record on file since 1977, with 11 health-based violations before October 19, 2016.
- Lead pipe inventory: 31 lead and 0 unknown out of 6,468 service lines.
Check whether Cary serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Active |
Full record since 1977
EPA's records for Cary go back to 1977. Before October 19, 2016 they list 11 health-based violations (7 resolved, 4 archived by EPA without a recorded fix) and 6 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1980s | 5 | 0 |
| 1990s | 6 | 4 |
| 2010 to October 18, 2016 | 0 | 1 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Barium, began October 1995, Resolved.
Show all 11 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Barium
Contaminant limit exceeded
|
Oct 1, 1995 | Resolved |
|
Barium
Contaminant limit exceeded
|
Jul 1, 1995 | Resolved |
|
Barium
Contaminant limit exceeded
|
Apr 1, 1995 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Dec 21, 1992 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1992 | Archived |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Nov 1, 1992 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 1, 1984 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Sep 14, 1984 | Resolved |
|
Barium
Contaminant limit exceeded
|
Jun 1, 1983 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 17, 1980 | Archived |
|
Barium
Contaminant limit exceeded
|
Jun 1, 1980 | Archived |
Where the water comes from
Cary draws water from 9 wells. 1 smaller public system such as schools, businesses or campgrounds buys water from Cary.
Annual water quality report
Cary must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Illinois.
Certified drinking water labs by state EPA guidance for private wells