What was found in Lakeside'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 | 460 µg/L 4.6% of the EPA limit 10000 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2012
Highest in the city: 4710 µg/L — TAMARACK WOODS HOA LAKESIDE · 180 people · 2019 | 7/9 | SYR4 |
| Nitrate-Nitrite | 538.5 µg/L 5.4% of the EPA limit 10000 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2019
Highest in the city: 4696 µg/L — TAMARACK WOODS HOA LAKESIDE · 180 people · 2019 | 8/9 | SYR4 |
| Copper | 208 µg/L 16% of the EPA limit 1300 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2018
Highest in the city: 482 µg/L — TAMARACK WOODS HOA LAKESIDE · 180 people · 2018 | 8/9 | SYR4 |
| Fluoride | 148 µg/L 3.7% of the EPA limit 4000 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2012
Highest in the city: 207 µg/L — JUNIPER BAY VILLAS · 26 people · 2017 | 8/9 | SYR4 |
| Barium | 106 µg/L 5.3% of the EPA limit 2000 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2012 | 7/9 | SYR4 |
| TTHM | 48.2 µg/L 60% of the EPA limit 80 µg/L Highest in the city: JUNIPER BAY VILLAS · 26 people · 2017 | 1/9 | SYR4 |
| Chloroform | 47 µg/L No EPA limit set Highest in the city: JUNIPER BAY VILLAS · 26 people · 2017 | 1/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 33.25 µg/L 55% of the EPA limit 60 µg/L Highest in the city: JUNIPER BAY VILLAS · 26 people · 2013 | 1/9 | SYR4 |
| Dichloroacetic Acid | 22.5 µg/L No EPA limit set Highest in the city: JUNIPER BAY VILLAS · 26 people · 2013 | 1/9 | SYR4 |
| Lead | 7 µg/L 47% of the EPA limit 15 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2018
Highest in the city: 18.5 µg/L — CHERRY VIEW · 352 people · 2018 | 8/9 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.33 pCi/L 22% of the EPA limit 15 pCi/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2016
Highest in the city: 11.24 pCi/L — JUNIPER BAY VILLAS · 26 people · 2017 | 7/9 | SYR4 |
| Trichloroacetic Acid | 9.815 µg/L No EPA limit set Highest in the city: JUNIPER BAY VILLAS · 26 people · 2013 | 1/9 | SYR4 |
| Combined Uranium | 3 µg/L 10% of the EPA limit 30 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2016
Highest in the city: 4 µg/L — TAMARACK WOODS HOA LAKESIDE · 180 people · 2016 | 7/9 | SYR4 |
| Combined Radium (-226 And -228) | 1.865 pCi/L 37% of the EPA limit 5 pCi/L Highest in the city: CHERRY VIEW · 352 people · 2015 | 3/9 | SYR4 |
| Bromodichloromethane | 1.59 µg/L No EPA limit set Highest in the city: JUNIPER BAY VILLAS · 26 people · 2017 | 1/9 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2019 | 3/9 | SYR4 |
| Picloram | 1 µg/L 0.2% of the EPA limit 500 µg/L Highest in the city: TAMARACK WOODS HOA LAKESIDE · 180 people · 2019 | 1/9 | SYR4 |
| Monochloroacetic Acid | 0.8100 µg/L No EPA limit set Highest in the city: JUNIPER BAY VILLAS · 26 people · 2013 | 1/9 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: LAKESIDE WATER SYSTEM · 1,225 people · 2025
Highest in the city: 0.0040 mg/L — LAKEVIEW PARK ESTATES HOMEOWNERS ASSOC · 92 people · 2024 | 9/9 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Lakeside
| Supplier | Population served |
|---|---|
| LAKESIDE WATER SYSTEM | 1,225 |
| CHERRY VIEW | 352 |
| TAMARACK WOODS HOA LAKESIDE | 180 |
| YOUTH WITH A MISSION | 150 |
| LAKEVIEW PARK ESTATES HOMEOWNERS ASSOC | 92 |
| PLEASANT GROVE MANUFACTURED HOME SITES | 70 |
| CHAUTAUQUA TERRACE HOA | 55 |
| HILLSIDE HOMES | 35 |
| JUNIPER BAY VILLAS | 26 |
Frequently asked questions about Lakeside tap water
Is Lakeside tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Lakeside. 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 Lakeside?
9 public water suppliers report drinking-water monitoring for Lakeside, Montana to the EPA. Each is listed above with its population served.
What contaminants are in Lakeside's water?
The contaminants EPA monitoring detected in Lakeside include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium. 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.