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Tap water quality report

Knoxville Water Works

EPA monitoring tested this supplier for 92 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

92
contaminants tested
12
detected
8,400
people served
3
health-based violations
Iowa rankingsLead in IowaPFAS in Iowa
Water source
Ground water
Ownership
Local government
Counties served
Marion

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
10
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1983-07-01 → 1987-06-30
MCL Health-based Archived 1983-07-01 → 1987-06-30
MCL Health-based Archived 1983-07-01 → 1987-06-30
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01
MR Monitoring Resolved 1992-07-01

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
94.17 µg/L 7.2%
of the EPA limit 1300 µg/L
worst single sample: 154 µg/L
60/60 SYR4 2013–2019
Lead
9.82 µg/L 65%
of the EPA limit 15 µg/L
worst single sample: 14.6 µg/L
33/60 SYR4 2013–2019
Lead
0.0078 mg/L 52%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Combined Radium (-226 And -228)
3.108 pCi/L 62%
of the EPA limit 5 pCi/L
worst single sample: 3.18 pCi/L
4/7 SYR4 2012–2018
Fluoride
1300 µg/L 33%
of the EPA limit 4000 µg/L
 2/2 SYR4 2013
Lithium
150 µg/L
No EPA limit set
 2/2 UCMR-5 2024
Barium
16.1 µg/L 0.8%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
Dibromoacetic Acid
0.6900 µg/L
No EPA limit set
 1/7 SYR4 2013–2019
Dichloroacetic Acid
1.89 µg/L
No EPA limit set
 1/7 SYR4 2013–2019
Nitrite
360 µg/L 36%
of the EPA limit 1000 µg/L
 1/2 SYR4 2019
Thallium, Total
0.6000 µg/L 30%
of the EPA limit 2 µg/L
 1/1 SYR4 2013
Trichloroacetic Acid
0.7100 µg/L
No EPA limit set
 1/7 SYR4 2013–2019
80 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBenzeneBenzo(A)PyreneBromodichloromethaneBromoformChlorobenzeneCadmiumCarbon TetrachlorideChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebDiquatEthylbenzeneGlyphosateHfpo-DaLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitratePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneTolueneTotal Haloacetic Acids (HAA5)TrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KNOXVILLE WATER WORKS
Phone
641-828-0557
Email
[email protected]

Frequently asked questions about Knoxville Water Works

Is Knoxville Water Works tap water safe to drink?

EPA monitoring detected 12 contaminants in Knoxville Water Works's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Knoxville Water Works's water?

EPA monitoring detected Copper, Lead, Lead, Combined Radium (-226 And -228), Fluoride, and others. The full list with the level and data source for each is above.

How many people does Knoxville Water Works serve?

Knoxville Water Works reports serving 8,400 people in Iowa, per its EPA record.

Has Knoxville Water Works had any water quality violations?

The EPA has 10 violations on file for Knoxville Water Works, of which 3 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.