Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IA1750048
PWS Name	MASON CITY WATER DEPARTMENT
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	27338
County Served	Cerro Gordo

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	201224	Returned to Compliance	01-JUN-2024	30-JUN-2024	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1121712	Returned to Compliance	01-AUG-2012	31-AUG-2012	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	17610	Returned to Compliance	01-JUL-2009	31-AUG-2009	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	299408	Returned to Compliance	01-JUN-2008	30-JUN-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	167705	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	167505	Returned to Compliance	01-OCT-2004	31-DEC-2004	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	257804	Returned to Compliance	01-AUG-2004	31-AUG-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	258204	Returned to Compliance	01-JUL-2004	30-SEP-2004	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	353205	Returned to Compliance	01-JUL-2004	-	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	99205	Returned to Compliance	01-JUL-2004	30-SEP-2004	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	136604	Returned to Compliance	01-MAR-2004	31-MAR-2004	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	133604	Returned to Compliance	01-JAN-2004	31-MAR-2004	Yes
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	115804	Returned to Compliance	01-OCT-2003	31-DEC-2003	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	114204	Returned to Compliance	01-JUL-2003	-	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	115704	Returned to Compliance	01-JUL-2003	30-SEP-2003	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	275003	Returned to Compliance	01-JUL-2003	30-SEP-2003	Yes
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	115404	Returned to Compliance	01-APR-2003	30-JUN-2003	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	133704	Returned to Compliance	01-APR-2003	31-MAR-2004	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	167104	Returned to Compliance	01-APR-2003	31-MAR-2004	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	156003	Known	01-JAN-2003	31-MAR-2003	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	132903	Returned to Compliance	01-JAN-2003	31-JAN-2003	Yes
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	115304	Returned to Compliance	01-JAN-2003	31-MAR-2003	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5703	Returned to Compliance	01-OCT-2002	31-OCT-2002	Yes
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	115004	Returned to Compliance	01-OCT-2002	31-DEC-2002	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	114804	Returned to Compliance	30-SEP-2002	30-DEC-2002	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	114104	Returned to Compliance	01-JUL-2002	-	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	114704	Returned to Compliance	01-JUL-2002	30-SEP-2002	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	114504	Returned to Compliance	01-APR-2002	30-JUN-2002	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	114404	Returned to Compliance	01-JAN-2002	31-MAR-2002	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	114004	Returned to Compliance	01-JUL-2001	-	No
Other	Notification, Public	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	114304	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MCL	Maximum Contaminant Level Violation, Single Sample	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	437202	Known	01-JAN-2000	31-DEC-2000	Yes
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4-D	110800	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	107200	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	103900	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	110500	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	107300	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	104000	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	110600	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	104600	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	107900	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	111200	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	104800	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	108100	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	111400	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	111100	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	107800	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	104500	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	108200	Returned to Compliance	01-JAN-1995	31-DEC-1999	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	104900	Returned to Compliance	01-JAN-1995	31-DEC-1999	No

1 - 50 of 142

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
537420	201224	SOX	State Compliance achieved	17-OCT-2024	State	-
537409	1121712	SOX	State Compliance achieved	18-SEP-2012	State	Sampled 9/18/2012 - no MCL or MV
10	17610	SOX	State Compliance achieved	01-JUL-2010	State	Sampled 7/1/2010
6	299408	SOX	State Compliance achieved	02-JAN-2009	State	Went 6 months w/o a violation
2	114304	SOX	State Compliance achieved	10-AUG-2006	State	-
533704	114104	SOX	State Compliance achieved	11-JUL-2006	State	-
1	5703	SOX	State Compliance achieved	29-JUN-2006	State	-
536904	114504	SOX	State Compliance achieved	28-JUN-2006	State	-
536504	114704	SOX	State Compliance achieved	28-JUN-2006	State	-
533804	115004	SOX	State Compliance achieved	28-JUN-2006	State	-
534904	115304	SOX	State Compliance achieved	28-JUN-2006	State	-
535304	115404	SOX	State Compliance achieved	28-JUN-2006	State	-
535704	115704	SOX	State Compliance achieved	28-JUN-2006	State	-
537305	353205	SOX	State Compliance achieved	28-JUN-2006	State	-
536104	115804	SOX	State Compliance achieved	28-JUN-2006	State	-
533204	114404	SOX	State Compliance achieved	24-FEB-2006	State	-
532904	114804	SOX	State Compliance achieved	24-FEB-2006	State	-
531204	133704	SOX	State Compliance achieved	21-APR-2005	State	-
531903	275003	SOX	State Compliance achieved	21-APR-2005	State	-
530704	114204	SOX	State Compliance achieved	11-APR-2005	State	-
530504	114004	SOX	State Compliance achieved	11-APR-2005	State	-
531304	136604	SOX	State Compliance achieved	11-APR-2005	State	-
529505	157198	SOX	State Compliance achieved	31-MAR-2005	State	-
531404	257804	SOX	State Compliance achieved	31-MAR-2005	State	-
530305	167705	SIF	State Public Notification received	18-MAR-2005	State	-
529805	167505	SFJ	State Formal Notice of Violation issued	17-FEB-2005	State	-
529605	99205	SOX	State Compliance achieved	11-FEB-2005	State	-
530804	133604	SOX	State Compliance achieved	11-FEB-2005	State	-
531504	258204	SOX	State Compliance achieved	11-FEB-2005	State	-
528504	167104	SOX	State Compliance achieved	09-JUN-2004	State	-
528003	132903	SOX	State Compliance achieved	16-DEC-2003	State	-
507100	101800	SOX	State Compliance achieved	07-FEB-2000	State	-
507000	101900	SOX	State Compliance achieved	07-FEB-2000	State	-
506900	102000	SOX	State Compliance achieved	07-FEB-2000	State	-
506800	102100	SOX	State Compliance achieved	07-FEB-2000	State	-
506700	102200	SOX	State Compliance achieved	07-FEB-2000	State	-
506000	102300	SOX	State Compliance achieved	07-FEB-2000	State	-
506500	102400	SOX	State Compliance achieved	07-FEB-2000	State	-
507900	102500	SOX	State Compliance achieved	07-FEB-2000	State	-
506400	102600	SOX	State Compliance achieved	07-FEB-2000	State	-
509500	102700	SOX	State Compliance achieved	07-FEB-2000	State	-
510700	102800	SOX	State Compliance achieved	07-FEB-2000	State	-
510600	102900	SOX	State Compliance achieved	07-FEB-2000	State	-
510500	103000	SOX	State Compliance achieved	07-FEB-2000	State	-
510400	103100	SOX	State Compliance achieved	07-FEB-2000	State	-
510300	103200	SOX	State Compliance achieved	07-FEB-2000	State	-
510200	103300	SOX	State Compliance achieved	07-FEB-2000	State	-
510100	103400	SOX	State Compliance achieved	07-FEB-2000	State	-
510000	103500	SOX	State Compliance achieved	07-FEB-2000	State	-
509900	103600	SOX	State Compliance achieved	07-FEB-2000	State	-

1 - 50 of 138

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL #12 (1947)	12336	Yes	Well	Ground water	Permanent	Active
WELL # 8 (1912)	9624	Yes	Well	Ground water	Permanent	Active
WELL #14 (1957)	9112	Yes	Well	Ground water	Permanent	Active
WELL #10 (1932)	8907	Yes	Well	Ground water	Permanent	Active
WELL # 9 (1913)	8240	Yes	Well	Ground water	Permanent	Active
WELL #16 (1990)	7538	Yes	Well	Ground water	Permanent	Active
WELL #A1 (1957)	28728	Yes	Well	Ground water	Permanent	Active
WELL #A3 (1980)	13711	Yes	Well	Ground water	Permanent	Active
WELL # 7 (1910)	13437	Yes	Well	Ground water	Permanent	Active
CLEAR WELL- 500,000 GALLONS	34273	No	Clear Well	-	-	Inactive
DISTRIBUTION SYSTEM	694	No	Distribution System/Zone	-	-	Active
CC TO WAYNE FEEDS DIVISION, IA1750892	15549	No	Other	-	-	Active
GENERAL PWS FACILITY	22290	No	Other	-	-	Active
CC TO ASHLEY INN MOTEL, IA1700649	33699	No	Other	-	-	Active
IN PLANT PUMPING PRIOR TO EDR UNITS	35508	No	Pump Facility	-	-	Active
TREATMENT PLANT FINISHED WATER PUMPING	35509	No	Pump Facility	-	-	Active
SOUTH FEDERAL AVE BOOSTER PUMPS	35510	No	Pump Facility	-	-	Active
SOUTH HOOVER AVE BOOSTER PUMPS	35511	No	Pump Facility	-	-	Active
WELLS A1,A3,7,8,9,10,12,14,16-TREATED	28553	No	Sampling Station	-	-	Active
SEP WELLS A1,7-10,12,14,16 AFTER TP	32532	No	Sampling Station	-	-	Inactive
WELL #16(90)	4500	No	Sampling Station	-	-	Inactive
WELL #14(57)	4501	No	Sampling Station	-	-	Inactive
WELL #12(47)	4502	No	Sampling Station	-	-	Inactive
WELLS A3(33),7,8,9,10	4503	No	Sampling Station	-	-	Inactive
GROUND STORAGE - 4M GALLON	13797	No	Storage	-	-	Active
S FEDERAL AVE 1M GALLON ELEVATED TANK	32533	No	Storage	-	-	Active
S HOOVER AVE 500,000 GAL ELEVATED TANK	32534	No	Storage	-	-	Active
KENTUCKY AVE 500,000 GAL ELEVATED TANK	32535	No	Storage	-	-	Active
S EISENHOWER AVE 500,000 GAL ELEVATED	32536	No	Storage	-	-	Active
43RD ST 1M GAL ELEVATED TANK	32537	No	Storage	-	-	Active
CLEAR WELL-500,000 GALLONS	35699	No	Storage	-	-	Active
TOTAL ELEVATED STORAGE	13798	No	Storage	-	-	Inactive
PLANT #5	28552	No	Treatment Plant	-	-	Active
PLANT #2	16848	No	Treatment Plant	-	-	Inactive
PLANT #3	16849	No	Treatment Plant	-	-	Inactive
PLANT #1	16850	No	Treatment Plant	-	-	Inactive
PLANT #4	16851	No	Treatment Plant	-	-	Inactive

1 - 37 of 37

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
PLANT #5	28552	Electrodialysis	Radionuclides removal
PLANT #5	28552	Innovative	Particulate removal
PLANT #5	28552	Innovative	Particulate removal
PLANT #5	28552	Innovative	Iron removal
PLANT #5	28552	Innovative	Iron removal
PLANT #5	28552	Innovative	Disinfection
PLANT #5	28552	4-Log Treatment of Viruses	Disinfection
PLANT #5	28552	Innovative	Disinfection
PLANT #5	28552	Innovative	Other
PLANT #5	28552	Fluoridation	Other
PLANT #5	28552	Innovative	Iron removal
PLANT #5	28552	Innovative	Iron removal
PLANT #5	28552	Innovative	Radionuclides removal

1 - 13 of 13

For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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