Hart Heritage, MD
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 10.4 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Hart Heritage serves about 37 people through 2 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Harford County, Maryland. EPA system ID: MD0120021; phone on file: 443-326-9081. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 8.7 ppb from 1.7 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Hart Heritage is 10.4 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 10.4 ppb over 10 |
| 2022 | 1.7 ppb |
| 2019 | 2.4 ppb |
| 2016 | -5 ppb |
How Hart Heritage 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. Hart Heritage's 10.4 ppb sits at the 98th percentile in Maryland and the 97th nationally (higher means more lead).
Neighbouring systems
15 other systems share Harford County; 0 of them have a higher latest lead result than Hart Heritage. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Harford County D.P.W. | 104,567 | 0 (not detected) |
| 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) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Street, MD may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Hart Heritage 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. What a 90th-percentile result does and does not tell you: how to read a lead result. This system is in the band the 2027 10 ppb rule changes.