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Tap water quality report

Union, MO

EPA monitoring detected 16 contaminants across the 7 water suppliers serving Union. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

7
water suppliers
13,153
people served
16
contaminants found
Missouri rankings Lead in Missouri PFAS in Missouri

What was found in Union'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
720 µg/L 7.2%
of the EPA limit 10000 µg/L
Main supplier: UNION PWS · 12,348 people · 2019
Highest in the city: 2360 µg/L — PRAIRIE DELL MHP · 30 people · 2019
6/7 SYR4
Barium
397.79999999999995 µg/L 20%
of the EPA limit 2000 µg/L
Main supplier: UNION PWS · 12,348 people · 2017
Highest in the city: 653.3 µg/L — ARGYLE ESTATES WATER SUPPLY · 380 people · 2017
7/7 SYR4
Fluoride
130 µg/L 3.3%
of the EPA limit 4000 µg/L
Main supplier: UNION PWS · 12,348 people · 2017
Highest in the city: 314 µg/L — LINN ACRES MOBILE HOME PARK · 25 people · 2018
5/7 SYR4
Copper
117.45 µg/L 9%
of the EPA limit 1300 µg/L
Main supplier: UNION PWS · 12,348 people · 2018
Highest in the city: 190.00999999999945 µg/L — SPRING MEADOWS MHP · 135 people · 2018
7/7 SYR4
Gross Alpha, Excl. Radon And U
4.97 pCi/L 33%
of the EPA limit 15 pCi/L
Main supplier: UNION PWS · 12,348 people · 2016
Highest in the city: 11.36 pCi/L — PRAIRIE DELL MHP · 30 people · 2019
3/7 SYR4
Lead
7.725999999999988 µg/L 52%
of the EPA limit 15 µg/L
Main supplier: UNION PWS · 12,348 people · 2018
Highest in the city: 10.397999999999982 µg/L — ARGYLE ESTATES WATER SUPPLY · 380 people · 2019
7/7 SYR4
TTHM
6.7395 µg/L 8.4%
of the EPA limit 80 µg/L
Main supplier: UNION PWS · 12,348 people · 2019
1/7 SYR4
Chloroform
6.26 µg/L
No EPA limit set
Main supplier: UNION PWS · 12,348 people · 2019
3/7 SYR4
Combined Radium (-226 And -228)
1 pCi/L 20%
of the EPA limit 5 pCi/L
Main supplier: UNION PWS · 12,348 people · 2016
Highest in the city: 4.13 pCi/L — PRAIRIE DELL MHP · 30 people · 2019
3/7 SYR4
Chromium
2.4659999999999997 µg/L 2.5%
of the EPA limit 100 µg/L
Main supplier: UNION PWS · 12,348 people · 2017
Highest in the city: 3.5164999999999997 µg/L — ARGYLE ESTATES WATER SUPPLY · 380 people · 2017
5/7 SYR4
Dichloroacetic Acid
2.68 µg/L
No EPA limit set
Main supplier: UNION PWS · 12,348 people · 2019
1/7 SYR4
Toluene
2.29 µg/L 0.2%
of the EPA limit 1000 µg/L
Highest in the city: BOURBEUSE MHP · 125 people · 2017
1/7 SYR4
Arsenic
1.609 µg/L 16%
of the EPA limit 10 µg/L
Main supplier: UNION PWS · 12,348 people · 2017
1/7 SYR4
Bromodichloromethane
0.8000 µg/L
No EPA limit set
Main supplier: UNION PWS · 12,348 people · 2019
1/7 SYR4
Dibromochloromethane
0.6425 µg/L
No EPA limit set
Main supplier: UNION PWS · 12,348 people · 2019
1/7 SYR4
Lead
0.0025 mg/L 17%
of the EPA limit 0.0150 mg/L
Main supplier: UNION PWS · 12,348 people · 2024
7/7 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 Union

SupplierPopulation served
UNION PWS 12,348
ARGYLE ESTATES WATER SUPPLY 380
SPRING MEADOWS MHP 135
BOURBEUSE MHP 125
HOLTGREWE FARMS SUBDIVISION 110
PRAIRIE DELL MHP 30
LINN ACRES MOBILE HOME PARK 25

Frequently asked questions about Union tap water

Is Union tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Union. 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 Union?

7 public water suppliers report drinking-water monitoring for Union, Missouri to the EPA. Each is listed above with its population served.

What contaminants are in Union's water?

The contaminants EPA monitoring detected in Union include Nitrate-Nitrite, Barium, Fluoride, Copper, Gross Alpha, Excl. Radon And U. 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.