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Tap water quality report

Colby, KS

EPA monitoring detected 22 contaminants across the 1 water supplier serving Colby. 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.

1
water supplier
5,516
people served
22
contaminants found
Kansas rankings Lead in Kansas PFAS in Kansas

What was found in Colby'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
9200 µg/L 92%
of the EPA limit 10000 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Fluoride
1700 µg/L 43%
of the EPA limit 4000 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Copper
390 µg/L 30%
of the EPA limit 1300 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Barium
137 µg/L 6.9%
of the EPA limit 2000 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Lithium
68 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2023
1/1 UCMR-5
TTHM
21.6 µg/L 27%
of the EPA limit 80 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Bromoform
13.6 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Lead
9.2 µg/L 61%
of the EPA limit 15 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Selenium
7.14 µg/L 14%
of the EPA limit 50 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Chromium
6.76 µg/L 6.8%
of the EPA limit 100 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Dibromochloromethane
6.3 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Atrazine
4.5 µg/L 150%
of the EPA limit, at the 95th percentile of samples — 3 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Arsenic
4.37 µg/L 44%
of the EPA limit 10 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2018
1/1 SYR4
Total Haloacetic Acids (HAA5)
4.1 µg/L 6.8%
of the EPA limit 60 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Bromodichloromethane
2.96 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Monobromoacetic Acid
2.2 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.9 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
1.65 pCi/L 33%
of the EPA limit 5 pCi/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Carbon Tetrachloride
1.427 µg/L 29%
of the EPA limit 5 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Chloroform
1.078 µg/L
No EPA limit set
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Tetrachloroethylene
0.5500 µg/L 11%
of the EPA limit 5 µg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2019
1/1 SYR4
Lead
0.0013 mg/L 8.7%
of the EPA limit 0.0150 mg/L
Main supplier: COLBY, CITY OF · 5,516 people · 2024
1/1 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 Colby

SupplierPopulation served
COLBY, CITY OF 5,516

Frequently asked questions about Colby tap water

Is Colby tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Colby. 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 Colby?

1 public water supplier report drinking-water monitoring for Colby, Kansas to the EPA. Each is listed above with its population served.

What contaminants are in Colby's water?

The contaminants EPA monitoring detected in Colby include Nitrate, Fluoride, Copper, Barium, Lithium. 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.