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Tap water quality report

Denison Water Supply

EPA monitoring tested this supplier for 90 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

90
contaminants tested
17
detected
9,381
people served
0
health-based violations
Iowa rankingsLead in IowaPFAS in Iowa
Water source
Ground water
Ownership
Local government
Counties served
Crawford

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.

0
health-based violations
13
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 2000-10-01 → 2001-09-30
MR Monitoring Resolved 1992-07-01 → 2002-03-01
MR Monitoring Resolved 1990-10-01 → 1990-12-31

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
46.62 µg/L 3.6%
of the EPA limit 1300 µg/L
worst single sample: 91.1 µg/L
59/60 SYR4 2013–2019
Lead
5.2 µg/L 35%
of the EPA limit 15 µg/L
worst single sample: 11.4 µg/L
26/60 SYR4 2013–2019
Bromodichloromethane
10.975 µg/L
No EPA limit set
worst single sample: 11.8 µg/L
16/16 SYR4 2013–2019
Bromoform
4.9175 µg/L
No EPA limit set
worst single sample: 5.57 µg/L
16/16 SYR4 2013–2019
Chloroform
34.4 µg/L
No EPA limit set
worst single sample: 38.9 µg/L
16/16 SYR4 2013–2019
Dibromoacetic Acid
4.805 µg/L
No EPA limit set
worst single sample: 5.03 µg/L
16/16 SYR4 2013–2019
Dibromochloromethane
12.2 µg/L
No EPA limit set
 16/16 SYR4 2013–2019
Dichloroacetic Acid
7.46 µg/L
No EPA limit set
worst single sample: 10.1 µg/L
16/16 SYR4 2013–2019
TTHM
53.825 µg/L 67%
of the EPA limit 80 µg/L
worst single sample: 60.5 µg/L
16/16 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
23.125 µg/L 39%
of the EPA limit 60 µg/L
worst single sample: 29.2 µg/L
16/16 SYR4 2013–2019
Trichloroacetic Acid
1.6675 µg/L
No EPA limit set
worst single sample: 1.99 µg/L
16/16 SYR4 2013–2019
Monochloroacetic Acid
14.97 µg/L
No EPA limit set
worst single sample: 20.5 µg/L
15/16 SYR4 2013–2019
Lead
0.0012 mg/L 8%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Nitrate
1300 µg/L 13%
of the EPA limit 10000 µg/L
 6/16 SYR4 2012–2019
Lithium
14 µg/L
No EPA limit set
 2/2 UCMR-5 2025
Barium
27.2 µg/L 1.4%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 1/1 SYR4 2013
73 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, TotalArsenicAtrazineBenzeneBenzo(A)PyreneChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylbenzeneGlyphosateHfpo-DaLassoMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DENISON WATER SUPPLY
Phone
712-263-4458
Email
[email protected]

Frequently asked questions about Denison Water Supply

Is Denison Water Supply tap water safe to drink?

EPA monitoring detected 17 contaminants in Denison Water Supply'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 Denison Water Supply's water?

EPA monitoring detected Copper, Lead, Bromodichloromethane, Bromoform, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Denison Water Supply serve?

Denison Water Supply reports serving 9,381 people in Iowa, per its EPA record.

Has Denison Water Supply had any water quality violations?

The EPA has 13 violations on file for Denison Water Supply, of which 0 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.