Boulder Water Quality Report
9 cities ranked · Average grade: B- · Colorado
Avg Score
74.8
Cities Ranked
9
Health Violations
9
PFAS Detected
0
74.8
County avg score
9
Cities ranked
67%
A or B grade
33%
D or F grade
9
Health violations
0
PFAS detected
Grade Distribution
How Boulder cities scored
A
6
67%
Excellent
B
0
0%
Good
C
0
0%
Fair
D
1
11%
Poor
F
2
22%
Failing
Comparison
County vs Colorado average
▲ 8.7 pts above state average
City Map
Water quality across Boulder
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Boulder
Best cities
Worst cities
County context
2
Superfund sites in Boulder
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Boulder
Industrial polluters nearby
Facilities reporting the most surface-water releases in Boulder, 2023.
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
DHARMACON INC LAFAYETTE, CO80026 | — | — |
SMYRNA READY MIX CONCRETE LLC - ROCK CREEK READY MIX LAFAYETTE, CO80026 | — | — |
READY MIXED CONCRETE CO PLANT 14 LAFAYETTE, CO80026 | — | — |
DIETERICH STANDARD INC BOULDER, CO80301 | — | — |
AGILENT TECHNOLOGIES BOULDER CO BOULDER, CO80301 | — | — |
+ 5 more facilities
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites
Superfund sites in Boulder
Superfund sites nearby
Federally tracked hazardous-waste sites within Boulder on the EPA National Priorities List.
- CAPTAIN JACK MILL
- MARSHALL LANDFILL
Source: EPA Superfund National Priorities List
Full Rankings
All 9 cities in Boulder
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Niwot | A | 93.7 | 20K | 70 | Health Unresolved | |
| 2 | Erie | A | 91.6 | 40K | 38 | Health | |
| 3 | Superior | A | 91.5 | 18K | 53 | Health Unresolved | |
| 4 | Longmont | A- | 89 | 107K | 46 | Health Unresolved | |
| 5 | Louisville | A- | 88.7 | 21K | 42 | Health Unresolved | |
| 6 | Nederland | A- | 87.6 | 2K | 26 | Health Unresolved | |
| 7 | Lyons | D | 45 | 4K | 116 | Health Unresolved | |
| 8 | Boulder | F | 43.4 | 171K | 116 | Health Unresolved | |
| 9 | Lafayette | F | 42.6 | 32K | 461 | Health Unresolved |