Chromium-6 in Dover, DE Drinking Water
Chromium-6 data for Dover, Delaware · 202,583 residents · 5 ZIP codes
Water monitoring in Dover, Delaware has logged Chromium-6 at detectable levels in recent sampling cycles.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Chromium-6 in Dover Tap Water
Chromium-6 has been detected in Dover, Delaware drinking water at a maximum level of 400 ppb — 4x the EPA MCL.
This analysis covers 202,583 residents across 5 ZIP codes in Dover.
Dover's overall water quality grade is A (89/100).
Is Chromium-6 in Dover Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or strong-base anion exchange filter certified under NSF 58 and testing your water independently.
Chromium-6 Levels by ZIP Code
| ZIP Code | Chromium-6 Level | EPA Limit | Status |
|---|---|---|---|
| 19903 | 400 ppb | 100 ppb (total chromium MCL) | Exceeds limit |
| 19905 | 400 ppb | 100 ppb (total chromium MCL) | Exceeds limit |
| 19906 | 400 ppb | 100 ppb (total chromium MCL) | Exceeds limit |
Average chromium-6 level across Dover: 400 ppb
Health Effects of Chromium-6
- Stomach and intestinal cancer (likely carcinogen via ingestion)
- Known carcinogen when inhaled
- Liver and kidney damage
- Reproductive and developmental harm
Health risk severity: High. Governed by the National Primary Drinking Water Regulations.
How Chromium-6 Gets Into Drinking Water
- Industrial discharge from steel and pulp mills
- Natural erosion of chromium deposits
- Coal ash disposal sites
- Cooling tower discharge
What to Do About Chromium-6 in Dover Water
- Reverse osmosis systems are most effective
- Strong-base anion exchange can reduce chromium-6
- Standard carbon filters are NOT effective for chromium-6
- Look for NSF 58 certification
Look for filters certified under NSF 58 for chromium-6 removal.