What was found in Holden'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-Nitrite | 16 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 480 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Chlorite | 440 µg/L 44% of the EPA limit 1000 µg/L Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Fluoride | 418.5 µg/L 10% of the EPA limit 4000 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2017 | 2/2 | SYR4 |
| Copper | 249 µg/L 19% of the EPA limit 1300 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019 | 2/2 | SYR4 |
| Barium | 105.95 µg/L 5.3% of the EPA limit 2000 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2017 | 2/2 | SYR4 |
| TTHM | 6.176 µg/L 7.7% of the EPA limit 80 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 98.3 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Chloroform | 0.8555 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 72.54 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 41.89 µg/L 70% of the EPA limit 60 µg/L Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 34.375 µg/L No EPA limit set Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Lithium | 29.6 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2024 | 1/2 | UCMR-5 |
| Dichloroacetic Acid | 1.494 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 24.34 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Lead | 20.49 µg/L 137% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 1.612 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 19.26 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 15.35 µg/L No EPA limit set Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 13.52 µg/L No EPA limit set Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 2.3345 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019
Highest in the city: 7.414 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 3.726 µg/L No EPA limit set Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Chromium | 2.09 µg/L 2.1% of the EPA limit 100 µg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2017
Highest in the city: 2.675 µg/L — HOLDEN PWS · 2,683 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.595 pCi/L 32% of the EPA limit 5 pCi/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2018 | 1/2 | SYR4 |
| Bromoform | 1.458 µg/L No EPA limit set Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2019 | 2/2 | SYR4 |
| Atrazine | 0.8900 µg/L 30% of the EPA limit 3 µg/L Highest in the city: HOLDEN PWS · 2,683 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0019 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: JOHNSON COUNTY PWSD 2 · 12,490 people · 2024 | 2/2 | 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 Holden
| Supplier | Population served |
|---|---|
| JOHNSON COUNTY PWSD 2 | 12,490 |
| HOLDEN PWS | 2,683 |
Frequently asked questions about Holden tap water
Is Holden tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Holden. 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 Holden?
2 public water suppliers report drinking-water monitoring for Holden, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Holden's water?
The contaminants EPA monitoring detected in Holden include Nitrate-Nitrite, Chlorite, Fluoride, Copper, 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.