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Tap water quality report

Red Oak Water Supply

EPA monitoring tested this supplier for 90 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

90
contaminants tested
20
detected
5,596
people served
12
health-based violations
Iowa rankingsLead in IowaPFAS in Iowa
Water source
Ground water
Ownership
Local government
Counties served
Montgomery

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.

12
health-based violations
293
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30

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
Nitrate
7100 µg/L 71%
of the EPA limit 10000 µg/L
worst single sample: 11500 µg/L
130/130 SYR4 2012–2019
Copper
888.6 µg/L 68%
of the EPA limit 1300 µg/L
worst single sample: 1400 µg/L
60/60 SYR4 2013–2019
Lead
7.48 µg/L 50%
of the EPA limit 15 µg/L
worst single sample: 114 µg/L
57/60 SYR4 2013–2019
Fluoride
749.5 µg/L 19%
of the EPA limit 4000 µg/L
worst single sample: 780 µg/L
42/97 SYR4 2012–2019
Lead
0.0027 mg/L 18%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Bromodichloromethane
2.08 µg/L
No EPA limit set
 6/6 SYR4 2013–2019
Chloroform
1.945 µg/L
No EPA limit set
worst single sample: 1.98 µg/L
6/6 SYR4 2013–2019
Dibromoacetic Acid
1.38 µg/L
No EPA limit set
worst single sample: 1.41 µg/L
6/6 SYR4 2013–2019
Dibromochloromethane
1.8375 µg/L
No EPA limit set
worst single sample: 1.84 µg/L
6/6 SYR4 2013–2019
TTHM
5.8075 µg/L 7.3%
of the EPA limit 80 µg/L
worst single sample: 5.89 µg/L
6/6 SYR4 2013–2019
Trichloroacetic Acid
0.8300 µg/L
No EPA limit set
 5/6 SYR4 2013–2019
Combined Radium (-226 And -228)
3.165 pCi/L 63%
of the EPA limit 5 pCi/L
worst single sample: 3.3 pCi/L
4/4 SYR4 2012–2018
Barium
240.7 µg/L 12%
of the EPA limit 2000 µg/L
worst single sample: 242 µg/L
3/3 SYR4 2013–2015
Monochloroacetic Acid
3.676 µg/L
No EPA limit set
worst single sample: 3.83 µg/L
3/6 SYR4 2013–2019
Lithium
16 µg/L
No EPA limit set
 3/6 UCMR-5 2025
Atrazine
0.3150 µg/L 11%
of the EPA limit 3 µg/L
worst single sample: 0.3200 µg/L
2/17 SYR4 2012–2018
Dichloroacetic Acid
1.738 µg/L
No EPA limit set
worst single sample: 1.74 µg/L
2/6 SYR4 2013–2019
Selenium
2.07 µg/L 4.1%
of the EPA limit 50 µg/L
worst single sample: 2.1 µg/L
2/3 SYR4 2013–2015
Total Haloacetic Acids (HAA5)
5.7625 µg/L 9.6%
of the EPA limit 60 µg/L
worst single sample: 5.77 µg/L
2/6 SYR4 2013–2019
Bromoform
0.7500 µg/L
No EPA limit set
 1/6 SYR4 2013–2019
70 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, TotalArsenicBenzeneBenzo(A)PyreneChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylbenzeneGlyphosateHfpo-DaLassoMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
RED OAK WATER SUPPLY
Phone
712-623-6526
Email
[email protected]

Frequently asked questions about Red Oak Water Supply

Is Red Oak Water Supply tap water safe to drink?

EPA monitoring detected 20 contaminants in Red Oak 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 Red Oak Water Supply's water?

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

How many people does Red Oak Water Supply serve?

Red Oak Water Supply reports serving 5,596 people in Iowa, per its EPA record.

Has Red Oak Water Supply had any water quality violations?

The EPA has 293 violations on file for Red Oak Water Supply, of which 12 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.