Lead in Rockville, MD Drinking Water
Lead data for Rockville, Maryland · 144,320 residents · 8 ZIP codes
Recent water testing in Rockville, Maryland has returned Lead readings above detection thresholds.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-06-04
Lead in Rockville Tap Water
Lead has been detected in Rockville, Maryland drinking water at a maximum level of 69 ppb — 4.6x the EPA action level.
This analysis covers 144,320 residents across 8 ZIP codes in Rockville.
Rockville's overall water quality grade is D (45/100).
Is Lead in Rockville Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or nsf 53 carbon block filter certified under NSF 53 / NSF 58 and testing your water independently.
Lead Levels by ZIP Code
| ZIP Code | Lead Level | EPA Limit | Status |
|---|---|---|---|
| 20847 | 69 ppb | 15 ppb (action level) | Exceeds limit |
| 20849 | 69 ppb | 15 ppb (action level) | Exceeds limit |
| 20857 | 69 ppb | 15 ppb (action level) | Exceeds limit |
Average lead level across Rockville: 69 ppb
Health Effects of Lead
- Brain development delays and reduced IQ in children
- Behavioral problems and learning disabilities
- High blood pressure and kidney damage in adults
- Increased risk of premature birth in pregnant women
Health risk severity: High. Governed by the Lead and Copper Rule Revisions (LCRR/LCRI).
How Lead Gets Into Drinking Water
- Corrosion of lead service lines (pipes connecting water main to home)
- Lead solder in copper plumbing joints (pre-1986 homes)
- Brass fixtures and faucets manufactured before 2014
- Stagnant water that sits in lead-containing pipes overnight
What to Do About Lead in Rockville Water
- Install an NSF 53 or NSF 58 certified filter at kitchen sink
- Run cold water for 30 seconds before using for drinking or cooking
- Use cold water only for cooking and preparing formula
- Consider whole-home reverse osmosis if lead service line is present
Look for filters certified under NSF 53 / NSF 58 for lead removal.