Mount Aetna, MD
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
Mount Aetna serves about 688 people through 146 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Washington County, Maryland. EPA system ID: MD0210015; phone on file: 240-313-2676. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 3.2 ppb from 3.2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Mount Aetna is 3.2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 3.2 ppb |
| 2019 | 2.25 ppb |
| 2016 | -2 ppb |
How Mount Aetna 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. Mount Aetna's reported as 0 (not detected) sits at the 35th percentile in Maryland and the 24th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
17 other systems share Washington County; 12 of them have a higher latest lead result than Mount Aetna. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Hagerstown | 92,200 | 0.8 ppb |
| Boonsboro - Keedysville | 4,250 | 3.26 ppb |
| Town Of Smithsburg Distribution System | 2,500 | - |
| Town Of Williamsport Distribution System | 2,400 | - |
| Town Of Hancock | 1,921 | 2.38 ppb |
| Lakeside Village | 1,575 | - |
| Town Of Sharpsburg | 1,360 | 3.6 ppb |
| Town Of Funkstown Distribution System | 1,300 | - |
| Highfield | 1,141 | 3.86 ppb |
| Town Of Clear Spring | 455 | 0 (not detected) |
What to do in your house
Look up your address in Mount Aetna'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 Mount Aetna 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.