What was found in Arlington's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1700 µg/L 17% of the EPA limit 10000 µg/L Highest in the city: KINGBROOK III RURAL WATER SYSTEM · 2,888 people · 2019 | 3/6 | SYR4 |
| Copper | 497 µg/L 38% of the EPA limit 1300 µg/L Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2018
Highest in the city: 1044 µg/L — KINGBROOK III RURAL WATER SYSTEM · 2,888 people · 2019 | 6/6 | SYR4 |
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L Highest in the city: SPRING LAKE COLONY · 114 people · 2013 | 2/6 | SYR4 |
| Nitrite | 214.5 µg/L 21% of the EPA limit 1000 µg/L Highest in the city: SPRING LAKE COLONY · 114 people · 2019 | 1/6 | SYR4 |
| TTHM | 41.2 µg/L 52% of the EPA limit 80 µg/L Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2019
Highest in the city: 83.25 µg/L — ARLINGTON · 915 people · 2019 | 5/6 | SYR4 |
| Lead | 3.86 µg/L 26% of the EPA limit 15 µg/L Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2018
Highest in the city: 32.88 µg/L — KINGBROOK II RURAL WATER SYSTEM · 2,715 people · 2018 | 6/6 | SYR4 |
| Barium | 32.3 µg/L 1.6% of the EPA limit 2000 µg/L Highest in the city: RAMONA · 159 people · 2017 | 4/6 | SYR4 |
| Lithium | 25.2 µg/L No EPA limit set Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2023 | 1/6 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 19.6 µg/L 33% of the EPA limit 60 µg/L Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2019
Highest in the city: 22.4 µg/L — ARLINGTON · 915 people · 2019 | 5/6 | SYR4 |
| Selenium | 15.6 µg/L 31% of the EPA limit 50 µg/L Highest in the city: SPRING LAKE COLONY · 114 people · 2013 | 4/6 | SYR4 |
| Chromium | 8.4 µg/L 8.4% of the EPA limit 100 µg/L Highest in the city: KINGBROOK II RURAL WATER SYSTEM · 2,715 people · 2012 | 4/6 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L Highest in the city: SPRING LAKE COLONY · 114 people · 2013 | 2/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.3 pCi/L 8.7% of the EPA limit 15 pCi/L Highest in the city: RAMONA · 159 people · 2012 | 1/6 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: KINGBROOK I RURAL WATER SYSTEM · 6,455 people · 2024
Highest in the city: 0.0030 mg/L — KINGBROOK III RURAL WATER SYSTEM · 2,888 people · 2025 | 6/6 | LCR |
Water suppliers serving Arlington
| Supplier | Population served |
|---|---|
| KINGBROOK I RURAL WATER SYSTEM | 6,455 |
| KINGBROOK III RURAL WATER SYSTEM | 2,888 |
| KINGBROOK II RURAL WATER SYSTEM | 2,715 |
| ARLINGTON | 915 |
| RAMONA | 159 |
| SPRING LAKE COLONY | 114 |
Frequently asked questions about Arlington tap water
Is Arlington tap water safe to drink?
EPA testing detected 14 contaminants in the water serving Arlington. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Arlington?
6 public water suppliers report drinking-water monitoring for Arlington, South Dakota to the EPA. Each is listed above with its population served.
What contaminants are in Arlington's water?
The contaminants EPA monitoring detected in Arlington include Nitrate, Copper, Fluoride, Nitrite, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.