Harford County D.P.W., MD
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2021-2023). 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 Harford County D.P.W.
Harford County D.P.W. serves about 104,567 people through 39,311 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Harford County, Maryland. EPA system ID: MD0120016; phone on file: 410-638-3939. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Harford County D.P.W. is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | -2 ppb |
How Harford County D.P.W. 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. Harford County D.P.W.'s reported as 0 (not detected) sits at the 51st 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
15 other systems share Harford County; 8 of them have a higher latest lead result than Harford County D.P.W.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Aberdeen | 18,006 | 0 (not detected) |
| Chapel Hill - Aberdeen Proving Grounds | 15,000 | 0 (not detected) |
| City Of Havre De Grace | 14,000 | 2 ppb |
| Maryland American Water Company | 13,200 | 2 ppb |
| Md American Water Greenridge | 2,351 | 0 (not detected) |
| Swan Harbour Dell Mobile Home Park | 500 | 6 ppb |
| Campus Hills Water Works | 250 | 2.4 ppb |
| Town Of Darlington | 250 | 0 (not detected) |
| Md American Water Lakeside Vista | 226 | 0 (not detected) |
| R & R Estates | 96 | 1.1 ppb |
Your move
Look up your address in Harford County D.P.W.'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 Harford County D.P.W. 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. The lead result guide covers how utilities pick the homes they sample. A zero today does not rule out a jump later - the rules are tightening in 2027.