Knolls Of Windsor, MD
Lead reported as not detected
Latest 90th-percentile lead: -1 ppb (monitoring period 2015-2017). 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
Knolls Of Windsor serves about 1,553 people through 1,062 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Frederick County, Maryland. EPA system ID: MD0100041; phone on file: 301-600-2581. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
The highest 90th-percentile result EPA holds for Knolls Of Windsor is -1 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2017 | -1 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. Knolls Of Windsor's -1 ppb sits at the 1st percentile in Maryland and the 0th nationally (higher means more lead).
Nearby utilities
27 other systems share Frederick County; 21 of them have a higher latest lead result than Knolls Of Windsor. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| New Design - Frederick County | 74,911 | 3 ppb |
| City Of Frederick | 54,000 | 1.1 ppb |
| Town Of Walkersville | 8,440 | 0 (not detected) |
| Fort Detrick | 7,900 | 0 (not detected) |
| City Of Brunswick | 7,312 | 1 ppb |
| Town Of Thurmont | 6,200 | 4 ppb |
| Town Of Middletown | 5,132 | - |
| Town Of Emmitsburg | 2,921 | 0 (not detected) |
| Mount Saint Marys University | 2,700 | 0 (not detected) |
| Fountaindale South | 2,610 | 1 ppb |
What to do in your house
Look up your address in Knolls Of Windsor'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 Knolls Of Windsor 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. Small systems behave differently: why small systems go over more often.