St Andrews S/D, NC
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
St Andrews S/D at a glance
St Andrews S/D serves about 84 people through 33 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Iredell County, North Carolina. EPA system ID: NC0149181; phone on file: 919-653-6999. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 10.7 ppb from 12.7 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for St Andrews S/D is 12.7 ppb across 3 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2022 | 12.7 ppb over 10 |
| 2016 | 2.29 ppb |
How St Andrews S/D compares
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. St Andrews S/D's 2 ppb sits at the 84th percentile in North Carolina and the 70th nationally (higher means more lead).
Other water systems in Iredell County
54 other systems share Iredell County; 7 of them have a higher latest lead result than St Andrews S/D. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mooresville Town Of | 54,455 | 0 (not detected) |
| Statesville, City Of | 30,843 | 0 (not detected) |
| Iredell Water Corporation | 29,370 | 0 (not detected) |
| Troutman, Town Of | 9,562 | 0 (not detected) |
| Harbour Point S/D | 4,031 | 0 (not detected) |
| Diamond Head S/D | 1,433 | 0 (not detected) |
| Mallard Head S/D | 869 | 0 (not detected) |
| Commodore Peninsula Wtr System | 610 | 0 (not detected) |
| Winding Forest/Bells Crossing S/D | 582 | 0 (not detected) |
| The Hampshires S/D | 561 | 0 (not detected) |
Your move
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 St Andrews S/D whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1900 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. Systems that went over once often dip back under; here is what that means.