Argos Municipal Water Plant, IN
Lead detected, under the action levels
Latest 90th-percentile lead: 1.2 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.
About Argos Municipal Water Plant
Argos Municipal Water Plant serves about 1,680 people through 733 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 Marshall County, Indiana. EPA system ID: IN5250001; phone on file: 574-930-6045. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 1.19 ppb from 2.39 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Argos Municipal Water Plant is 5.15 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.2 ppb |
| 2025 | 2.39 ppb |
| 2024 | 3.25 ppb |
| 2023 | 3.07 ppb |
| 2023 | 3.49 ppb |
| 2022 | 5.15 ppb |
| 2022 | 3.33 ppb |
Where this result ranks
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. Argos Municipal Water Plant's 1.2 ppb sits at the 47th percentile in Indiana and the 59th nationally (higher means more lead).
Neighbouring systems
11 other systems share Marshall County; 5 of them have a higher latest lead result than Argos Municipal Water Plant. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Plymouth Water Department | 10,241 | 2.7 ppb |
| Bremen Water Department | 4,516 | 2.6 ppb |
| Culver Educational Foundation | 1,940 | 0 (not detected) |
| Bourbon Water Department | 1,767 | 0 (not detected) |
| Culver Water Department | 1,391 | 1.74 ppb |
| Ancilla Domini (Convent) | 680 | 5.5 ppb |
| Gatewood Estates | 202 | 0 (not detected) |
| Pretty View Condominium Owners Assoc | 85 | 1.18 ppb |
| Creekside Manor Mhp | 73 | 0 (not detected) |
| Inwood Estates | 50 | 1.4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Argos, 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 Argos Municipal Water Plant whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1380 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.