What was found in Creston'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 | 2254.9999999999995 µg/L 23% of the EPA limit 10000 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Copper | 1240 µg/L 95% of the EPA limit 1300 µg/L Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2018 | 2/2 | SYR4 |
| Fluoride | 784.5 µg/L 20% of the EPA limit 4000 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Chlorite | 752.9999999999998 µg/L 75% of the EPA limit 1000 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Barium | 128 µg/L 6.4% of the EPA limit 2000 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| TTHM | 95.09999999999997 µg/L 119% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 78.6 µg/L 131% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Chloroform | 77.5 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 43.54999999999998 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 28.19999999999999 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Lead | 24.549999999999994 µg/L 164% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2018 | 2/2 | SYR4 |
| Bromodichloromethane | 17 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 5.8 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 5 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 1.5 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9850 µg/L 16% of the EPA limit 6 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.9000 µg/L 30% of the EPA limit 3 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Picloram | 0.8000 µg/L 0.2% of the EPA limit 500 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.7000 µg/L No EPA limit set Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2019 | 2/2 | SYR4 |
| Dalapon | 0.6700 µg/L 0.3% of the EPA limit 200 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2018 | 1/2 | SYR4 |
| P-Dichlorobenzene | 0.5000 µg/L 0.7% of the EPA limit 75 µg/L Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: SIRWA #2 (CRESTON) · 20,793 people · 2024
Highest in the city: 0.0070 mg/L — CRESTON WATER SUPPLY · 7,536 people · 2025 | 2/2 | LCR |
| Pfba | 0.0051 µg/L No EPA limit set Highest in the city: CRESTON WATER SUPPLY · 7,536 people · 2023 | 1/2 | UCMR-5 |
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 Creston
| Supplier | Population served |
|---|---|
| SIRWA #2 (CRESTON) | 20,793 |
| CRESTON WATER SUPPLY | 7,536 |
Frequently asked questions about Creston tap water
Is Creston tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Creston. 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 Creston?
2 public water suppliers report drinking-water monitoring for Creston, Iowa to the EPA. Each is listed above with its population served.
What contaminants are in Creston's water?
The contaminants EPA monitoring detected in Creston include Nitrate, Copper, Fluoride, Chlorite, 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.