Public Water System: Mason City Water Department

MyTapWater.org's tap water quality report is the compilation of data collected from federal, state, and local government agencies, most prominently the EPA. We strive to populate the report with the latest data concerning water contaminants, lead and copper levels, and water quality violations. We only collect drinking water data from public water systems.

PWS Service Information
PWS ID: IA1750048
Type: Community water system
EPA Region: 07
Primary Service Area: Municipality
Primary Source: Ground water
Population Served: 28,079
Contact Information
MASON CITY WATER DEPARTMENT
MASON CITY WATER DEPARTMENT
ATTN DON THORSON WATER SUPT
10 FIRST NW
MASON CITY, IA 50401

This public water system services 1 zip code in 1 municipality in 1 county.

Summary Results


A summary view of the the times a water contaminant was tested and found to exceed the level set by the EPA (the MCL).

Maximum Contaminant Levels Exceeded (by year):

2013   (0) 2014   (1) 2015   (1)
chlorate chlorate

Contaminant Detailed Results


This a view of violations of maximum contaminant levels. In the expanded view you can see each know test date for a given contaminant, the result of the test, the minimum level that can be recognized in a test (MRL), and upper limit that is considered healthy (HRL).

chlorate
Is this in your home's pipes?

Year Test Date MRL HRL Test Result
2015 2015-06-03 20 210 244
2015 2015-06-03 20 210 < 20
2014 2014-12-02 20 210 210
2014 2014-12-02 20 210 < 20

Other Water Contaminants Tested


The following contaminants were tested and within national EPA guidelines.

The last mile of pipe makes a big difference, learn more about testing your water.

Contaminant MRL HRL Avg Result
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.02 0.07 < 0.02
2014 2014-12-02 0.02 0.07 < 0.02
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.03 0 < 0.03
2014 2014-12-02 0.03 0 < 0.03
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.2 140 < 0.2
2014 2014-12-02 0.2 140 < 0.2
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.03 0.0004 < 0.03
2014 2014-12-02 0.03 0.0004 < 0.03
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.06 90 < 0.06
2014 2014-12-02 0.06 90 < 0.06
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.1 0.0103 < 0.1
2014 2014-12-02 0.1 0.0103 < 0.1
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.08 0 < 0.08
2014 2014-12-02 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.09 0 < 0.09
2014 2014-12-02 0.09 0 < 0.09
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.03 6.14 < 0.03
2014 2014-12-02 0.03 6.14 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.02 0 < 0.02
2014 2014-12-02 0.02 0 < 0.02
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.07 0.35 < 0.07
2014 2014-12-02 0.07 0.35 < 0.07
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.01 0 < 0.01
2014 2014-12-02 0.01 0 < 0.01
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.04 0.07 < 0.04
2014 2014-12-02 0.04 0.07 < 0.04
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-02 0.2 2.69 < 0.2
2014 2014-12-02 0.2 2.69 < 0.2
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 1 70 < 1
2015 2015-06-03 1 70 < 1
2014 2014-12-02 1 70 < 1
2014 2014-12-02 1 70 < 1
chromium-6 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 0.03 0 < 0.03
2015 2015-06-03 0.03 0 < 0.03
2014 2014-12-02 0.03 0 < 0.03
2014 2014-12-02 0.03 0 < 0.03
molybdenum 1 40 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 1 40 < 1
2015 2015-06-03 1 40 < 1
2014 2014-12-02 1 40 < 1
2014 2014-12-02 1 40 < 1
vanadium 0.2 21 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 0.2 21 < 0.2
2015 2015-06-03 0.2 21 < 0.2
2014 2014-12-02 0.2 21 < 0.2
2014 2014-12-02 0.2 21 < 0.2
chromium 0.2 100 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 0.2 100 < 0.2
2015 2015-06-03 0.2 100 < 0.2
2014 2014-12-02 0.2 100 < 0.2
2014 2014-12-02 0.2 100 < 0.2
strontium 0.3 1500 247.5 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-03 0.3 1500 329
2015 2015-06-03 0.3 1500 195
2014 2014-12-02 0.3 1500 299
2014 2014-12-02 0.3 1500 167

Lead and Copper Data


Lead and copper are recorded separately from other contaminants because of the Lead and Copper Rule. As with all other results, these are the findings at the water supply. Lead and copper can be — and often are — added to drinking water in between the water facility and a tap.

Sample ID Contaminant Sampling Start Date Sampling End Date Result
IA43054 lead 2015-01-01 2017-12-31 0.0043mg/L
IA40237 lead 2012-01-01 2014-12-31 0.0093mg/L
IA37640 lead 2009-01-01 2011-12-31 0.0093mg/L
IA34693 lead 2006-01-01 2008-12-31 0.0042mg/L

Violations


Known violations of the Safe Drinking Water Act as recorded by the EPA.

Compliance Dates Rule Violation Type Contaminant Name Status
2012-08-01 - 2012-08-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2009-07-01 - 2009-08-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2008-06-01 - 2008-06-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2004-10-01 - 2004-12-31 Radionuclides Monitoring, Regular Gross Alpha, Excl. Radon and U Returned to Compliance
2004-10-01 - 2004-12-31 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Returned to Compliance
2004-07-01 - 2004-09-30 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Returned to Compliance
2004-07-01 - 2004-09-30 Radionuclides Monitoring, Regular Gross Alpha, Excl. Radon and U Returned to Compliance
2004-08-01 - 2004-08-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2003-04-01 - 2004-03-31 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Returned to Compliance
2003-04-01 - 2004-03-31 Nitrates Monitoring, Regular Nitrate Returned to Compliance
2004-03-01 - 2004-03-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2004-01-01 - 2004-03-31 Radionuclides Maximum Contaminant Level Violation, Single Sample Combined Radium (-226 and -228) Returned to Compliance
2003-10-01 - 2003-12-31 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2003-07-01 - 2003-09-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2003-07-01 - 2003-09-30 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Returned to Compliance
2003-04-01 - 2003-06-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2003-01-01 - 2003-03-31 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2003-01-01 - 2003-03-31 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Known
2003-01-01 - 2003-01-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2002-10-01 - 2002-12-31 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2002-09-30 - 2002-12-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2002-10-01 - 2002-10-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2002-07-01 - 2002-09-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2002-04-01 - 2002-06-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2002-01-01 - 2002-03-31 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
1992-07-01 - 2002-03-01 Lead and Copper Rule Initial Tap Sampling for Pb and Cu Lead and Copper Rule Returned to Compliance
2001-01-01 - 2001-03-31 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
2000-01-01 - 2000-12-31 Radionuclides Maximum Contaminant Level Violation, Single Sample Combined Radium (-226 and -228) Known
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular o-Dichlorobenzene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular p-Dichlorobenzene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2-Dichloroethane Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular cis-1,2-Dichloroethylene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1-Dichloroethylene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular trans-1,2-Dichloroethylene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular DICHLOROMETHANE Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2-Dichloropropane Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Ethylbenzene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular CHLOROBENZENE Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Styrene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Tetrachloroethylene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Toluene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2,4-Trichlorobenzene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1,1-Trichloroethane Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1,2-Trichloroethane Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Trichloroethylene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Vinyl chloride Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Xylenes, Total Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular LASSO Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Atrazine Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Benzo(a)pyrene Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular 2,4-D Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Dalapon Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Di(2-ethylhexyl) adipate Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Di(2-ethylhexyl) phthalate Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Dinoseb Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Pentachlorophenol Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Picloram Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular Simazine Returned to Compliance
1995-01-01 - 1999-12-31 Synthetic Organic Chemicals Monitoring, Regular 2,4,5-TP Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Benzene Returned to Compliance
1995-01-01 - 1999-12-31 Volatile Organic Chemicals Monitoring, Regular Carbon tetrachloride Returned to Compliance
1993-07-01 - 1997-06-30 Radionuclides Maximum Contaminant Level Violation, Single Sample Combined Radium (-226 and -228) Returned to Compliance
1988-07-01 - 1991-06-30 Nitrates Monitoring, Regular Nitrate Returned to Compliance
1989-07-01 - 1989-09-30 Radionuclides Monitoring, Regular Combined Radium (-226 and -228) Returned to Compliance
1989-04-01 - 1989-06-30 Radionuclides Monitoring, Regular Combined Radium (-226 and -228) Returned to Compliance
1986-07-01 - 1986-09-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
1985-10-01 - 1986-09-30 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Known
1982-10-01 - 1986-09-30 Radionuclides Notification, Public Combined Radium (-226 and -228) Returned to Compliance
1985-04-01 - 1985-09-30 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Known
1980-04-01 - 1984-03-31 Radionuclides Maximum Contaminant Level Violation, Single Sample Combined Radium (-226 and -228) Returned to Compliance
1980-09-18 - 1980-10-17 Radionuclides Maximum Contaminant Level Violation, Average Combined Radium (-226 and -228) Known
2002-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance
2001-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance
2003-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance
2004-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance

What My Water Data Means


Water data isn't always easy to interpret, but by following the links on this page you should be able to have most of your questions answered. By clicking the name of a water contaminant or secondary substance you can learn about that specific substance. Ultimately this page should give you some insight towards learning if your water is safe, what water filter you should buy (if any), and how well your local water compares against other sources.

Sources


The origin of MyTapWater.org's water data is explained on our Data Sources page.

Why Is My Water Data Not More Recent?


The recency of the data for your ZIP code depends on the last your water source was tested, by a federal, state, or local agency. More information about the timing can be determined by learning about the dataset in question and seeing how often the EPA (other another governing body) mandated testing.