Tap Truth EPA drinking water records, in plain English

Public water system record

Leon Water Supply

Serves Leon, Decatur County, IA · 1,830 people served

Federal records show 4 health-based violations and 3 monitoring/reporting issues for Leon Water Supply in the last ten years. The most serious issue in this window was a resolved Surface Water Treatment Rule violation.

  • IA2742076
  • LEON
  • IA
  • 1,830 served

System profile

Source water Surface water
ZIP 50144
EPA system ID IA2742076

Verify this system on EPA ECHO →

Health-based violations, last 10 years
4
Resolved
4
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Leon Water Supply draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit), 2016.
  • Most recent formal enforcement: signed compliance agreement by Iowa, September 1986.
  • Record on file since 1978, with 17 health-based violations before October 19, 2016.
  • Lead pipe inventory: 82 lead and 207 unknown out of 978 service lines.

Check whether Leon Water Supply serves your address

Address suggestions by Mapbox

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Surface Water Treatment Rule
Treatment technique failure
 120 Jul 1, 2023 Resolved No
Surface Water Treatment Rule
Treatment technique failure
 120 Sep 1, 2022 Resolved No
Surface Water Treatment Rule
Treatment technique failure
 120 Aug 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2016 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Haloacetic Acids (HAA5)
Monitoring and reporting
 Feb 1, 2022 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Feb 1, 2022 Resolved
CARBON, TOTAL
Monitoring and reporting
 Jul 1, 2018 Resolved

Full record since 1978

EPA's records for Leon Water Supply go back to 1978. Before October 19, 2016 they list 17 health-based violations (5 resolved, 12 archived by EPA without a recorded fix) and 3 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 7 0
1980s 6 2
1990s 0 1
2010 to October 18, 2016 4 0
October 19, 2016 to 2019 0 1
2020s 3 2

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.

Show all 17 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 Oct 1, 2016 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 Jul 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jul 1, 2016 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 Apr 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Oct 1, 1985 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Oct 1, 1984 Archived
Fluoride
Contaminant limit exceeded
 Oct 1, 1984 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Oct 1, 1983 Archived
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
 Oct 1, 1983 Archived
Fluoride
Contaminant limit exceeded
 Oct 1, 1983 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Nov 9, 1979 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Nov 9, 1979 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Nov 9, 1979 Archived
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Oct 1, 1979 Resolved
Fluoride
Contaminant limit exceeded
 Jan 22, 1979 Archived
Fluoride
Contaminant limit exceeded
 Oct 23, 1978 Archived
Fluoride
Contaminant limit exceeded
 Oct 23, 1978 Archived

Enforcement actions

Iowa regulators took 2 formal enforcement actions against Leon Water Supply between 1985 and 1986, filed as 3 records in EPA's data. The most recent was a signed compliance agreement in September 1986.

Date By Action Violations covered
Sep 30, 1986 Iowa Signed compliance agreement 1 violation (1 health-based): Combined Radium (-226 and -228)
Jan 25, 1985 Iowa Signed compliance agreement 2 violations (2 health-based): Combined Radium (-226 and -228)

What the violations mean

Surface Water Treatment Rule

3 incidents

The system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).

The utility had to notify customers about each of these violations.

Total Trihalomethanes (TTHMs)

1 incident

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Leon Water Supply draws water from 1 surface water intake. 1 other community water system buys water from Leon Water Supply.

Community systems that buy water from it

Annual water quality report

Leon Water Supply must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Iowa.

Certified drinking water labs by state EPA guidance for private wells