Willwood S/D (4650004), SC
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 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.
About Willwood S/D (4650004)
Willwood S/D (4650004) serves about 122 people through 59 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in York County, South Carolina. EPA system ID: SC4650004; phone on file: 803-324-1047. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 15 ppb from 15 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Willwood S/D (4650004) is 19 ppb across 8 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 15 ppb over 10 |
| 2023 | 19 ppb over 15 |
| 2023 | 5 ppb |
| 2022 | 4 ppb |
| 2022 | 5 ppb |
| 2021 | 10 ppb |
| 2018 | 3 ppb |
Against other South Carolina systems
Of the 553 South Carolina systems with a lead result, the median latest reading is 0.73 ppb; 3 are over 15 ppb right now and 47 have gone over at some point. Willwood S/D (4650004)'s reported as 0 (not detected) sits at the 12th percentile in South Carolina and the 11th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in York County
61 other systems share York County; 26 of them have a higher latest lead result than Willwood S/D (4650004). If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rock Hill City Of (Sc4610002) | 89,850 | 2 ppb |
| York County East Wd (Sc4620002) | 30,225 | 3 ppb |
| Fort Mill Town Of (Sc4610003) | 25,000 | 0 (not detected) |
| York County West Wd (Sc4620003) | 18,273 | 0 (not detected) |
| York City Of (Sc4610001) | 11,137 | 0 (not detected) |
| Tega Cay City Of (Sc4610008) | 10,500 | 0 (not detected) |
| Clover Town Of | 8,400 | 0 (not detected) |
| Riverview Rural Cws (Sc4620001) | 2,200 | 0 (not detected) |
| Hickory Grove Town Of (Sc4610004) | 654 | 2 ppb |
| Bgwc Foxwood (Sc4650008) | 575 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Rock Hill, SC 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 Willwood S/D (4650004) whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1820 ppb (copper action level 1,300 ppb).
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. Why an old exceedance still matters: over the limit before, under it now.