Contra Costa Water Quality Report
9 cities ranked · Average grade: B · California
Avg Score
76.5
Cities Ranked
9
Health Violations
7
PFAS Detected
4
76.5
County avg score
9
Cities ranked
67%
A or B grade
22%
D or F grade
7
Health violations
4
PFAS detected
Grade Distribution
How Contra Costa cities scored
A
5
56%
Excellent
B
1
11%
Good
C
1
11%
Fair
D
1
11%
Poor
F
1
11%
Failing
Comparison
County vs California average
= Exactly at state average
City Map
Water quality across Contra Costa
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Contra Costa
Worst cities
County context
2
Superfund sites in Contra Costa
1,053,910
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Contra Costa
Industrial polluters nearby
Facilities reporting the most surface-water releases in Contra Costa, 2023.
Total reported releases to surface water: 1,053,910 lbs
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
PHILLIPS 66 RODEO RENEWABLE ENERGY COMPLEX RODEO, CA94572 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 529,346 |
MARTINEZ REFINING CO LLC MARTINEZ, CA94553 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 473,779 |
CHEVRON PRODUCTS CO RICHMOND REFINERY RICHMOND, CA94801 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 44,396 |
TESORO REFINING & MARKETING CO LLC MARTINEZ, CA94553 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 5,793 |
MECS INC. MARTINEZ, CA94553 | Vanadium compounds | 404 |
+ 5 more facilities
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites
Superfund sites in Contra Costa
Superfund sites nearby
Federally tracked hazardous-waste sites within Contra Costa on the EPA National Priorities List.
- CONCORD NAVAL WEAPONS STATION
- UNITED HECKATHORN CO
Source: EPA Superfund National Priorities List
Full Rankings
All 9 cities in Contra Costa
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Discovery Bay | A+ | 97.1 | 17K | 3 | Health | |
| 2 | Antioch | A | 94.3 | 115K | 3 | Health | |
| 3 | Martinez | A | 93 | 31K | 9 | Unresolved | |
| 4 | Pittsburg | A | 90.2 | 63K | 3 | Unresolved | |
| 5 | Clayton | A- | 86.6 | 680 | 26 | Health Unresolved | |
| 6 | Concord | B- | 72.3 | 199K | 66 | Health Unresolved | |
| 7 | Bethel Island | C+ | 66 | 1K | 60 | Health Unresolved | |
| 8 | Oakley | D | 45.3 | 45K | 93 | Health Unresolved | |
| 9 | Brentwood | F | 44.1 | 65K | 137 | Health Unresolved |