Walnut Creek, 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.
Walnut Creek at a glance
Walnut Creek serves about 158 people through 56 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Calvert County, Maryland. EPA system ID: MD0040035; phone on file: 410-535-1600. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Walnut Creek 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 Walnut Creek 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. Walnut Creek's reported as 0 (not detected) sits at the 17th percentile in Maryland and the 13th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
28 other systems share Calvert County; 6 of them have a higher latest lead result than Walnut Creek. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Chesapeake Ranch Estates | 9,500 | 0 (not detected) |
| Town Of Chesapeake Beach | 5,000 | 0 (not detected) |
| Prince Frederick | 4,371 | 0 (not detected) |
| Solomons | 3,811 | 0 (not detected) |
| Town Of North Beach | 3,000 | 0 (not detected) |
| Beaches Water Co-Operative | 2,000 | 1.5 ppb |
| Scientists Cliffs | 1,425 | 0 (not detected) |
| Chesapeake Heights (Bayside Forest) | 1,190 | 3 ppb |
| Summit/Highlands | 1,108 | 0 (not detected) |
| The Calverton School | 461 | 0 (not detected) |
Your move
Look up your address in Walnut Creek'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 Walnut Creek 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.