Mchenry Water Quality Report
17 cities ranked · Average grade: B+ · Illinois
Avg Score
80.1
Cities Ranked
17
Health Violations
16
PFAS Detected
6
80.1
County avg score
17
Cities ranked
88%
A or B grade
6%
D or F grade
16
Health violations
6
PFAS detected
Grade Distribution
How Mchenry cities scored
A
9
53%
Excellent
B
6
35%
Good
C
1
6%
Fair
D
0
0%
Poor
F
1
6%
Failing
Comparison
County vs Illinois average
▲ 0.4 pts above state average
City Map
Water quality across Mchenry
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Mchenry
County context
1
Superfund site in Mchenry
99.8%
of residents on fluoridated water (CDC, 2020)
9
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Mchenry
Industrial polluters nearby
Facilities reporting the most surface-water releases in Mchenry, 2023.
Total reported releases to surface water: 9 lbs
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
SCOT FORGE CO SPRING GROVE, IL60081 | Nickel | 9 |
MATHEWS CO CRYSTAL LAKE, IL60012 | — | — |
AMPAC FLEXIBLES LLC (PREVIOUSLY FLEXICON INC) CARY, IL60013 | — | — |
TRUE VALUE MANUFACTURING CARY, IL60013 | — | — |
G & M MANUFACTURING CORP CRYSTAL LAKE, IL60014 | — | — |
+ 5 more facilities
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites
Superfund sites in Mchenry
Superfund sites nearby
Federally tracked hazardous-waste sites within Mchenry on the EPA National Priorities List.
- WOODSTOCK MUNICIPAL LANDFILL
Source: EPA Superfund National Priorities List
Full Rankings
All 17 cities in Mchenry
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Holiday Hills | A | 94.5 | 868 | 5 | Unresolved | |
| 2 | Huntley | A | 93.4 | 28K | 24 | Health Unresolved | |
| 3 | Harvard | A | 90.3 | 9K | 19 | Health Unresolved | |
| 4 | Crystal Lake | A- | 89.2 | 41K | 15 | Health Unresolved | |
| 5 | Richmond | A- | 88.3 | 2K | 19 | Health Unresolved | |
| 6 | Algonquin | A- | 86.8 | 31K | 23 | Health Unresolved | |
| 7 | Cary | A- | 86.5 | 18K | 19 | Health Unresolved | |
| 8 | Marengo | A- | 86.2 | 8K | 7 | Health Unresolved | |
| 9 | Lake In The Hills | A- | 85.7 | 29K | 15 | Health Unresolved | |
| 10 | Union | B+ | 83.4 | 594 | 29 | Health Unresolved | |
| 11 | Fox River Grove | B | 76.6 | 5K | 48 | Health Unresolved | |
| 12 | Hebron | B | 76 | 1K | 7 | Health Unresolved | |
| 13 | Woodstock | B- | 74.1 | 26K | 11 | Health Unresolved | |
| 14 | Johnsburg | B- | 73.7 | 1K | 78 | Health Unresolved | |
| 15 | Lakewood | B- | 71.3 | 4K | 54 | Health Unresolved | |
| 16 | Wonder Lake | C+ | 69.7 | 6K | 171 | Health Unresolved | |
| 17 | Mchenry | F | 36.4 | 38K | 385 | Health PFAS Unresolved |