Chromium-6 in California Drinking Water — 143 ZIPs T...
EPA data analysis for chromium-6 in California drinking water systems
Chromium-6 Contamination in California
ZipCheckup analyzed drinking water data across 2,630 ZIP codes in California for chromium-6 contamination. 143 ZIP codes have reported chromium-6 detections, and 38 have EPA violations on record.
The violation rate for chromium-6 in California is 1.4% of all ZIP codes — roughly in line with the national average.
EPA Standard for Chromium-6
The EPA maximum contaminant level (MCL) for chromium-6 is 100 ppb (total chromium MCL), governed by the National Primary Drinking Water Regulations. Water systems that exceed this limit must take corrective action and notify consumers.
Worst ZIP Codes for Chromium-6 in California
These ZIP codes reported the highest chromium-6 levels in California based on CCR reports and EPA data:
Lowest Chromium-6 Levels in California
These ZIP codes had the lowest reported chromium-6 detections in California:
Health Effects of Chromium-6
How to Remove Chromium-6 From Drinking Water
The most effective treatment for chromium-6 removal is Reverse Osmosis or Strong-Base Anion Exchange. Look for filters certified under NSF 58 standards.
Check Your ZIP Code
Use the ZipCheckup water quality search to see chromium-6 data for your specific water system in California.
Worst ZIP Codes for Chromium-6 in California
Ranked by highest chromium-6 detection level.
| Rank | ZIP Code | City | Level Detected | EPA Limit | Status |
|---|---|---|---|---|---|
| 1 | 90265 | Malibu | 680 ppb | 100 ppb | Exceeds |
| 2 | 90290 | Topanga | 680 ppb | 100 ppb | Exceeds |
| 3 | 91301 | Agoura Hills | 680 ppb | 100 ppb | Exceeds |
| 4 | 91302 | Calabasas | 680 ppb | 100 ppb | Exceeds |
| 5 | 91304 | Canoga Park | 680 ppb | 100 ppb | Exceeds |
| 6 | 91305 | Canoga Park | 680 ppb | 100 ppb | Exceeds |
| 7 | 91308 | West Hills | 680 ppb | 100 ppb | Exceeds |
| 8 | 91309 | Canoga Park | 680 ppb | 100 ppb | Exceeds |
| 9 | 91361 | Westlake Village | 680 ppb | 100 ppb | Exceeds |
| 10 | 91364 | Woodland Hills | 680 ppb | 100 ppb | Exceeds |
| 11 | 91365 | Woodland Hills | 680 ppb | 100 ppb | Exceeds |
| 12 | 91372 | Calabasas | 680 ppb | 100 ppb | Exceeds |
| 13 | 95721 | Echo Lake | 600 ppb | 50 ppb | Exceeds |
| 14 | 95735 | Twin Bridges | 600 ppb | 50 ppb | Exceeds |
| 15 | 96150 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
| 16 | 96151 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
| 17 | 96152 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
| 18 | 96154 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
| 19 | 96155 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
| 20 | 96156 | South Lake Tahoe | 600 ppb | 50 ppb | Exceeds |
Lowest Chromium-6 Levels in California
Cities with Chromium-6 Data in California
32 cities in California have chromium-6 testing data available.
+ 12 more cities