City Of Rockville, MD
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2018-2018). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About City Of Rockville
City Of Rockville serves about 52,000 people through 17,500 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Montgomery County, Maryland. EPA system ID: MD0150003. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is up 2 ppb from -2 ppb in the period ending 2017. The highest 90th-percentile result EPA holds for City Of Rockville is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2018 | 0 (not detected) |
| 2017 | -2 ppb |
| 2017 | -2 ppb |
| 2016 | -5 ppb |
How City Of Rockville compares
Of the 437 Maryland systems with a lead result, the median latest reading is 0 ppb; 3 are over 15 ppb right now and 21 have gone over at some point. City Of Rockville's reported as 0 (not detected) sits at the 50th percentile in Maryland and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
4 other systems share Montgomery County; 1 of them has a higher latest lead result than City Of Rockville. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Washington Suburban Sanitary Commission | 1,900,000 | 0 (not detected) |
| Town Of Poolesville | 6,005 | 5 ppb |
| Fairland Crossing Apartments | 1,248 | - |
| Whitley Park Condominiums | 256 | - |
Next steps for Maryland
Look up your address in City Of Rockville's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask City Of Rockville whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.