Slippery Rock Muni Auth, PA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.55 ppb (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. 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.
Slippery Rock Muni Auth at a glance
Slippery Rock Muni Auth serves about 15,778 people through 1,978 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Butler County, Pennsylvania. EPA system ID: PA5100079; phone on file: 724-794-8303. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Slippery Rock Muni Auth is 1.19 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.55 ppb |
| 2022 | 0 (not detected) |
| 2019 | 1.19 ppb |
| 2016 | 0 (not detected) |
Against other Pennsylvania systems
Of the 516 Pennsylvania systems with a lead result, the median latest reading is 2 ppb; 143 are over 15 ppb right now and 156 have gone over at some point. Slippery Rock Muni Auth's 0.55 ppb sits at the 26th percentile in Pennsylvania and the 44th nationally (higher means more lead).
Nearby utilities
30 other systems share Butler County; 6 of them have a higher latest lead result than Slippery Rock Muni Auth. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Pa American Water Co Butler | 43,286 | 2 ppb |
| Cranberry Twp Wtp | 42,000 | 0.53 ppb |
| Municipal Water Auth Adams Twp | 8,700 | 0.59 ppb |
| Harmony Boro Water Auth | 6,669 | 2.2 ppb |
| Zelienople Boro | 4,123 | 6.04 ppb |
| Petroleum Valley Rwa | 3,800 | 0 (not detected) |
| Seven Fields Boro Water Dept | 3,100 | - |
| Evans City Borough | 1,990 | - |
| Mars Borough Water Works | 1,956 | - |
| Chicora Boro Water Supply | 1,100 | - |
Next steps for Slippery Rock, PA
Test your own tap with a certified lab first-draw sample; Slippery Rock, PA 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 Slippery Rock Muni Auth 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. The action level is dropping - the 10 ppb rule from 2027.