Monon Water Utility, IN
Lead detected, under the action levels
Latest 90th-percentile lead: 2.29 ppb (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. 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.
Monon Water Utility at a glance
Monon Water Utility serves about 1,700 people through 701 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in White County, Indiana. EPA system ID: IN5291010; phone on file: 219-253-6441. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 1.11 ppb from 3.4 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Monon Water Utility is 4.26 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.29 ppb |
| 2025 | 3.4 ppb |
| 2024 | 2.68 ppb |
| 2022 | 4.26 ppb |
How Monon Water Utility compares
Of the 687 Indiana systems with a lead result, the median latest reading is 1.31 ppb; 6 are over 15 ppb right now and 36 have gone over at some point. Monon Water Utility's 2.29 ppb sits at the 71st percentile in Indiana and the 75th nationally (higher means more lead).
Other water systems in White County
9 other systems share White County; 3 of them have a higher latest lead result than Monon Water Utility. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Monticello Water Works | 5,300 | 1.99 ppb |
| Brookston Water Department | 1,815 | 0 (not detected) |
| Wolcott Water Works | 1,001 | 2.31 ppb |
| Chalmers Water Works | 550 | 1.89 ppb |
| Reynolds Water Works | 533 | 0 (not detected) |
| Royal Oaks Homeowners Assn., Inc. | 390 | 6.5 ppb |
| Lake Hill Park - Thayer Inc. | 104 | 0.99 ppb |
| Lazy Oaks | 48 | - |
| Scenic View Mobile Home Community | 25 | 4.11 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Monon, IN 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 Monon Water Utility whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2010 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. Size matters more than most people expect: small vs large water systems.