Patuxent Naval Air Station (Navfac-Wash), 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.
About Patuxent Naval Air Station (Navfac-Wash)
Patuxent Naval Air Station (Navfac-Wash) serves about 22,000 people through 832 service connections, which makes it a large system under EPA's size classes. It is federally owned and draws groundwater, in St. Mary'S County, Maryland. EPA system ID: MD0180022; phone on file: 443-477-1919. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2019 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Patuxent Naval Air Station (Navfac-Wash) is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | -2 ppb |
Where this result ranks
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. Patuxent Naval Air Station (Navfac-Wash)'s reported as 0 (not detected) sits at the 49th percentile in Maryland and the 39th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
36 other systems share St. Mary'S County; 5 of them have a higher latest lead result than Patuxent Naval Air Station (Navfac-Wash). If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lexington Park | 43,030 | 0 (not detected) |
| Town Of Leonardtown | 5,000 | 0 (not detected) |
| Country Lakes | 3,016 | 0 (not detected) |
| Cedar Cove | 2,728 | 0 (not detected) |
| Saint Marys College | 2,200 | 0 (not detected) |
| Wicomico Shores | 1,262 | 0 (not detected) |
| Greenbrier | 1,161 | 0 (not detected) |
| Breton Bay | 1,012 | 0 (not detected) |
| Lord Calvert Trailer Park | 892 | 0 (not detected) |
| Hunting Quarters | 715 | 0 (not detected) |
What to do in your house
Look up your address in Patuxent Naval Air Station (Navfac-Wash)'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 Patuxent Naval Air Station (Navfac-Wash) 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. Small systems behave differently: why small systems go over more often.