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PWS ID	IA8482096
PWS Name	ROCK VALLEY WATER SUPPLY
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	4059
County Served	Sioux

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
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	45825	Returned to Compliance	01-AUG-2024	31-AUG-2024	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	45925	Returned to Compliance	01-AUG-2024	31-AUG-2024	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	46105	Returned to Compliance	01-SEP-2004	30-SEP-2004	No
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	561602	Returned to Compliance	01-AUG-2002	31-AUG-2002	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	399600	Returned to Compliance	01-AUG-2000	31-AUG-2000	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	213800	Returned to Compliance	01-MAY-2000	31-MAY-2000	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	68800	Returned to Compliance	01-DEC-1999	31-DEC-1999	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	390499	Returned to Compliance	01-JUN-1999	30-JUN-1999	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	400399	Returned to Compliance	01-MAY-1999	31-MAY-1999	No
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	193898	Returned to Compliance	01-SEP-1998	30-SEP-1998	Yes
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	151698	Returned to Compliance	01-JUL-1998	30-SEP-1998	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3298	Returned to Compliance	01-OCT-1997	31-OCT-1997	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	26197	Returned to Compliance	01-NOV-1996	30-NOV-1996	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	131095	Returned to Compliance	01-JAN-1995	31-MAR-1995	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	130995	Returned to Compliance	01-JAN-1995	31-MAR-1995	No
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	378193	Returned to Compliance	01-JUL-1993	30-SEP-1993	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	219891	Returned to Compliance	01-JAN-1991	31-JAN-1991	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	23988	Returned to Compliance	01-JAN-1988	31-MAR-1988	Yes

1 - 18 of 18

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
828511	45825	SOX	State Compliance achieved	05-AUG-2025	State	Sampled
828512	45925	SOX	State Compliance achieved	05-AUG-2025	State	Sampled
828505	46105	SIF	State Public Notification received	29-NOV-2004	State	-
828002	561602	SOX	State Compliance achieved	10-FEB-2003	State	-
13	390499	SOX	State Compliance achieved	15-OCT-2001	State	-
8	399600	SOX	State Compliance achieved	15-OCT-2001	State	-
827201	193898	SOX	State Compliance achieved	15-OCT-2001	State	-
6	213800	SOX	State Compliance achieved	15-OCT-2001	State	-
1	68800	SOX	State Compliance achieved	15-OCT-2001	State	-
827201	151698	SOX	State Compliance achieved	15-OCT-2001	State	-
824099	400399	SOX	State Compliance achieved	14-JUN-1999	State	-
252398	3298	SOX	State Compliance achieved	14-MAY-1998	State	-
262397	26197	SOX	State Compliance achieved	12-MAY-1997	State	-
29595	131095	SOX	State Compliance achieved	21-AUG-1995	State	-
100595	130995	SOX	State Compliance achieved	21-AUG-1995	State	-
286693	378193	SOX	State Compliance achieved	01-DEC-1994	State	-
357191	219891	SIF	State Public Notification received	26-MAR-1991	State	-
15988	23988	SOX	State Compliance achieved	01-MAY-1989	State	-

1 - 18 of 18

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC FROM ROCK VALLEY RWD, IA8482701	20495	Yes	Consecutive Connection	Ground water	Emergency	Inactive
PLUGGED WELL # 3 (1960)	7914	Yes	Well	Ground water	Permanent	Inactive
WELL # 7 (2004)	28900	Yes	Well	Ground water	Permanent	Inactive
WELL # 4 (1968)	8463	Yes	Well	Ground water	Permanent	Active
WELL #11 (2024)	36866	Yes	Well	Ground water	Permanent	Active
WELL #10 SRF WELL (2025)	36865	Yes	Well	Ground water	Permanent	Active
WELL #9	36176	Yes	Well	Ground water	Permanent	Active
WELL # 3 (1987)	28923	Yes	Well	Ground water	Permanent	Active
WELL # 8 (2004)	28901	Yes	Well	Ground water	Permanent	Active
PLUGGED WELL # 6 (1977)	7771	Yes	Well	Ground water	Other	Inactive
PLUGGED WELL # 2 (1956)	12346	Yes	Well	Ground water	Other	Inactive
PLUGGED WELL # 5 (1981)	11292	Yes	Well	Ground water	Other	Inactive
WELL # 1 (1922)	10479	Yes	Well	Ground water	Other	Inactive
DISTRIBUTION SYSTEM	3886	No	Distribution System/Zone	-	-	Active
GENERAL PWS FACILITY	25546	No	Other	-	-	Active
CC TO ROCK VALLEY RURAL WATER, IA8482701	15201	No	Other	-	-	Inactive
HIGH SERVICE PUMPS	35598	No	Pump Facility	-	-	Active
WELLS 3, 4, 8, 9 OR 11 @ WELLHOUSE 9	28899	No	Sampling Station	-	-	Active
SS FROM ROCK VALLEY RWD, IA8482701	20496	No	Sampling Station	-	-	Inactive
WELLS 4 & 6 AT WELL 4 WELLHOUSE	5455	No	Sampling Station	-	-	Inactive
WELL 3 AT THE WELL 3 WELLHOUSE	5456	No	Sampling Station	-	-	Inactive
BIG TOWER	20492	No	Storage	-	-	Active
INDUSTRIAL TOWER	32030	No	Storage	-	-	Active
NORTH TOWER	14343	No	Storage	-	-	Inactive
TREATMENT PLANT - WELLHOUSE 4	20494	No	Treatment Plant	-	-	Active
TREATMENT PLANT - WELLHOUSE 3	20493	No	Treatment Plant	-	-	Inactive

1 - 26 of 26

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Corrosion control
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Disinfection
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Disinfection
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Other
TREATMENT PLANT - WELLHOUSE 4	20494	Fluoridation	Other
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Corrosion control
TREATMENT PLANT - WELLHOUSE 4	20494	Innovative	Corrosion control

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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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