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Twin Valley Lakes Improvement Assn

EPA monitoring tested this supplier for 59 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

59
contaminants tested
11
detected
100
people served
65
health-based violations
Iowa rankingsLead in IowaPFAS in Iowa
Water source
Ground water
Ownership
Private
Counties served
Johnson

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.

65
health-based violations
161
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2010-07-01 → 2010-07-31
MCL Health-based Resolved 2009-09-01 → 2009-09-30
MCL Health-based Resolved 2009-09-01 → 2009-09-30
MCL Health-based Resolved 2009-09-01 → 2009-09-30
MCL Health-based Resolved 2009-09-01 → 2009-09-30

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
Copper
998 µg/L 77%
of the EPA limit 1300 µg/L
worst single sample: 1200 µg/L
22/26 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
 9/25 SYR4 2012–2019
Ethylbenzene
5.375 µg/L 0.8%
of the EPA limit 700 µg/L
worst single sample: 6.5 µg/L
6/7 SYR4 2013–2019
Xylenes, Total
32.25 µg/L 0.3%
of the EPA limit 10000 µg/L
worst single sample: 39 µg/L
6/7 SYR4 2013–2019
Combined Radium (-226 And -228)
1.19 pCi/L 24%
of the EPA limit 5 pCi/L
worst single sample: 1.2 pCi/L
2/2 SYR4 2012–2018
Arsenic
9 µg/L 90%
of the EPA limit 10 µg/L
 1/1 SYR4 2016
Barium
140 µg/L 7%
of the EPA limit 2000 µg/L
 1/1 SYR4 2016
Chloroform
0.7000 µg/L
No EPA limit set
 1/1 SYR4 2019
Dichloroacetic Acid
1 µg/L
No EPA limit set
 1/1 SYR4 2019
Fluoride
320 µg/L 8%
of the EPA limit 4000 µg/L
 1/1 SYR4 2016
48 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBenzeneBenzo(A)PyreneBromodichloromethaneBromoformChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNitrateNitritePentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Trichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
TWIN VALLEY LAKES IMPROVEMENT ASSN
Email
[email protected]

Frequently asked questions about Twin Valley Lakes Improvement Assn

Is Twin Valley Lakes Improvement Assn tap water safe to drink?

EPA monitoring detected 11 contaminants in Twin Valley Lakes Improvement Assn'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 Twin Valley Lakes Improvement Assn's water?

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

How many people does Twin Valley Lakes Improvement Assn serve?

Twin Valley Lakes Improvement Assn reports serving 100 people in Iowa, per its EPA record.

Has Twin Valley Lakes Improvement Assn had any water quality violations?

The EPA has 161 violations on file for Twin Valley Lakes Improvement Assn, of which 65 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.