Rock Hill Water Association, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 1.7 ppb (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. 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.
Who runs the water here
Rock Hill Water Association serves about 915 people through 358 service connections, which makes it a small system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Oktibbeha County, Mississippi. EPA system ID: MS0530017; phone on file: 662-418-0186. They can tell you what your service line is made of and whether they pay to replace it.
Rock Hill Water Association's lead record
That is up 1.7 ppb from 0 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Rock Hill Water Association is 1.7 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.7 ppb |
| 2020 | 0 (not detected) |
| 2017 | 1.4 ppb |
How Rock Hill Water Association compares
Of the 973 Mississippi systems with a lead result, the median latest reading is 1 ppb; 9 are over 15 ppb right now and 44 have gone over at some point. Rock Hill Water Association's 1.7 ppb sits at the 72nd percentile in Mississippi and the 66th nationally (higher means more lead).
Other water systems in Oktibbeha County
23 other systems share Oktibbeha County; 3 of them have a higher latest lead result than Rock Hill Water Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Starkville | 32,027 | 1.7 ppb |
| Ms State University | 15,000 | 1.6 ppb |
| Clayton Village W/A #1-East | 4,984 | 3.31 ppb |
| Oktoc Water Association #1 | 2,587 | 1.3 ppb |
| Adaton W/A #1-Josey Creek | 2,170 | 1.5 ppb |
| Talking Warrior Water Assn #1 | 1,539 | 0 (not detected) |
| Chapel Hill-Pleasant Grove W/A | 1,175 | 0 (not detected) |
| Sessums Water Association | 1,117 | 0.9 ppb |
| Black Jack Water Assn #1 | 1,024 | 0.5 ppb |
| Double Springs Water Assn | 797 | 0.68 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Starkville, MS 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 Rock Hill Water Association 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. The action level is dropping - the 10 ppb rule from 2027.