Knollwood S/D, NC
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Knollwood S/D serves about 46 people through 18 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Gaston County, North Carolina. EPA system ID: NC0136231; phone on file: 919-653-6999. They can tell you what your service line is made of and whether they pay to replace it.
Knollwood S/D's lead record
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Knollwood S/D is 23.8 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 9 ppb |
| 2022 | 23.8 ppb over 15 |
| 2016 | 11.9 ppb over 10 |
Against other North Carolina systems
Of the 1,925 North Carolina systems with a lead result, the median latest reading is 0 ppb; 5 are over 15 ppb right now and 75 have gone over at some point. Knollwood S/D's reported as 0 (not detected) sits at the 4th percentile in North Carolina and the 3rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
134 other systems share Gaston County; 31 of them have a higher latest lead result than Knollwood S/D. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Two Rivers Utilities | 96,714 | 0 (not detected) |
| Mount Holly, City Of | 19,200 | 2.05 ppb |
| Belmont, City Of | 17,477 | 0 (not detected) |
| Dallas, Town Of | 8,212 | 0 (not detected) |
| Cherryville, City Of | 6,353 | 0 (not detected) |
| Stanley, Town Of | 5,750 | 2 ppb |
| Bessemer City, City Of | 5,730 | 0 (not detected) |
| Ranlo, Town Of | 4,511 | 0 (not detected) |
| Lowell, City Of | 3,837 | 0 (not detected) |
| Belmont Abbey College | 1,325 | 0 (not detected) |
Next steps for Cary, NC
Test your own tap with a certified lab first-draw sample; Cary, NC 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 Knollwood S/D 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. More in what a past exceedance means today.