Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CO0105900
PWS Name	WALSH TOWN OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	650
County Served	Baca

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
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3012450	Returned to Compliance	26-OCT-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012451	Known	01-OCT-2025	31-DEC-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012449	Known	01-JUL-2025	30-SEP-2025	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3012446	Returned to Compliance	26-APR-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012447	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012448	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012445	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012444	Known	01-OCT-2024	31-DEC-2024	Yes
Other	Public Notification Violation without NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3012442	Returned to Compliance	15-SEP-2024	-	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012443	Returned to Compliance	01-JUL-2024	30-SEP-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012441	Returned to Compliance	01-APR-2024	30-JUN-2024	Yes
Other	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	3012440	Returned to Compliance	21-APR-2023	-	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012438	Returned to Compliance	01-OCT-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012437	Returned to Compliance	01-APR-2022	30-JUN-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012436	Returned to Compliance	01-JAN-2022	31-MAR-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012435	Returned to Compliance	01-OCT-2021	31-DEC-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	3012434	Returned to Compliance	01-JUL-2021	30-SEP-2021	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	3012433	Returned to Compliance	01-OCT-2019	-	No
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012432	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	3012429	Returned to Compliance	01-JUL-2018	30-SEP-2018	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	3012427	Returned to Compliance	12-JAN-2018	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	3012428	Returned to Compliance	12-JAN-2018	-	Yes
Other	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	3012425	Returned to Compliance	13-SEP-2017	-	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	3012415	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	3012410	Returned to Compliance	01-APR-2008	30-JUN-2008	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	3012409	Returned to Compliance	01-APR-2008	30-APR-2008	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3012308	Returned to Compliance	01-OCT-2007	31-OCT-2007	Yes
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	3011107	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	3011407	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	3011307	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	3011207	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Thallium, Total	3012107	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Beryllium, Total	3012007	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	3011607	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Nickel	3011707	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	3011907	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Chromium	3011507	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	3012207	Returned to Compliance	01-APR-2007	30-JUN-2007	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	3007807	Returned to Compliance	01-OCT-2006	31-DEC-2006	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	3007705	Returned to Compliance	01-OCT-2004	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	3001504	Returned to Compliance	01-JUL-2004	-	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	2901795	Returned to Compliance	01-JAN-1993	31-DEC-1993	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	3001392	Returned to Compliance	01-MAY-1992	31-MAY-1992	No

1 - 43 of 43

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
3549928	3012451	SIE	State Public Notification requested	17-DEC-2025	State	-
3549926	3012450	SOX	State Compliance achieved	24-NOV-2025	State	PN/COD for 02 vio (4010 MCL 3Q2025) received 11/06/25, per wiki SOX date = vio issuance date (lfra 11/24/25);
3549924	3012449	SIF	State Public Notification received	06-NOV-2025	State	-
3549921	3012448	SIF	State Public Notification received	01-JUL-2025	State	PN/COD for 2Q2025 4010 MCL vio received 07/01/25 indicating delivery on 06/27/25 (lfra 07/09/25);
3549917	3012447	SIF	State Public Notification received	29-MAY-2025	State	-
3549913	3012446	SIA	State Violation/Reminder Notice	02-MAY-2025	State	-
3549912	3012445	SIF	State Public Notification received	28-APR-2025	State	PN/COD for 4010 MCL violation received 04/29/25 indicating late distribution on 04/28/25, PN vio issued and immediately returned to compliance (lfra 05/02/25);
3549918	3012443	SOX	State Compliance achieved	24-FEB-2025	State	2Q2024 and 3Q2024 NO3 MCL violations RTC with 2Qs (4Q2024 and 1Q2025) without MCL violation, 1Q2025 confirmation sample result reported 02/24/25 (lfra 06/08/25);
3549918	3012441	SOX	State Compliance achieved	24-FEB-2025	State	2Q2024 and 3Q2024 NO3 MCL violations RTC with 2Qs (4Q2024 and 1Q2025) without MCL violation, 1Q2025 confirmation sample result reported 02/24/25 (lfra 06/08/25);
3549909	3012444	SIF	State Public Notification received	30-DEC-2024	State	PN for 4010 MCL vio complete and timely distributed/submitted (lfra 01/01/25);
3549903	3012442	SOX	State Compliance achieved	20-SEP-2024	State	PN vio for failure to perform T1 PN after RT NO3 sample >MCL, RTC with completion and submittal of PN/COD (lfra 09/20/24);
3549897	3012440	SOX	State Compliance achieved	10-MAY-2023	State	-
3549898	3012438	SOX	State Compliance achieved	28-APR-2023	State	2 consecutive quarters of data below MCL
3549890	3012437	SOX	State Compliance achieved	10-FEB-2023	State	Returned to compliance Q12023 w/ 2 consecutive (Q1/2023 and Q4/2022) below LRAA and on quarterly monitoring**5/3/2023
3549889	3012436	SOX	State Compliance achieved	11-JUL-2022	State	Results received 4/13/2022 and 7/13/2022 both below MCL TJ
3549888	3012435	SOX	State Compliance achieved	11-APR-2022	State	Results received 1/17/2022 and 4/13/2022 below MCL
3549888	3012434	SOX	State Compliance achieved	11-APR-2022	State	Results received 1/17/2022 and 4/13/2022 below MCL
3549881	3012429	SFL	State Administrative/Compliance Order without penalty issued	28-MAR-2022	State	Amendment One to DW.02.19.105900 issued on 3/28/22. ejc
3549881	3012432	SFL	State Administrative/Compliance Order without penalty issued	28-MAR-2022	State	Amendment One to DW.02.19.105900 issued on 3/28/22. ejc
3549870	3012433	SOX	State Compliance achieved	17-NOV-2019	State	System submitted all LCR ME information and sample sites. AS
3549850	3012427	SIF	State Public Notification received	03-APR-2018	State	-
3549851	3012428	SIF	State Public Notification received	03-APR-2018	State	-
3549843	3012425	SOX	State Compliance achieved	31-OCT-2017	State	-
3549823	3012415	SOX	State Compliance achieved	20-AUG-2010	State	Atrazine result received 20 Aug 2010.
3549816	3012409	SOX	State Compliance achieved	17-NOV-2008	State	>6 months without a violation-SOXd. cj
3549815	3012410	SOX	State Compliance achieved	10-NOV-2008	State	-
3549810	3012308	SOX	State Compliance achieved	21-MAY-2008	State	>6 months. SOXd. cj
3549809	3001392	SOX	State Compliance achieved	04-APR-2008	State	>6 mo wo violations. SOXd. aj
3549307	3011707	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011307	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011207	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011107	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011907	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011407	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3012007	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3012107	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3012207	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011507	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3549307	3011607	SOX	State Compliance achieved	12-JUL-2007	State	Received late. Sampled 6/18/07.
3548707	3007807	SOX	State Compliance achieved	28-FEB-2007	State	Recd late. dg
3548207	3007705	SOX	State Compliance achieved	31-JAN-2007	State	-
3548005	3001504	SOX	State Compliance achieved	26-JAN-2005	State	-
2901795	2901795	SO6	State Intentional no-action	06-MAR-1995	State	-

1 - 43 of 43

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SCHOOL WELL	1624	Yes	Well	Ground water	Emergency	Active
RAILROAD WELL	13163	Yes	Well	Ground water	Permanent	Inactive
SOUTH CITY WELL	1623	Yes	Well	Ground water	Permanent	Active
OLD CITY WELL AKA SHOP WELL	1625	Yes	Well	Ground water	Emergency	Active
DISTRIBUTION SYSTEM	6460	No	Distribution System/Zone	-	-	Active
PARK TANK	17588	No	Storage	-	-	Active
SCHOOL TANK	17589	No	Storage	-	-	Active
SHOP TANK	20584	No	Storage	-	-	Active
CHLORINATOR FOR OLD CITY WELL	13578	No	Treatment Plant	-	-	Active
CHLORINATOR FOR SCHOOL WELL	17587	No	Treatment Plant	-	-	Active
CHLORINATION FOR SOUTH CITY WELL	3405	No	Treatment Plant	-	-	Active
CHLORINATOR FOR RAILROAD WELL	13577	No	Treatment Plant	-	-	Inactive

1 - 12 of 12

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
CHLORINATOR FOR RAILROAD WELL	13577	Innovative	Disinfection
CHLORINATOR FOR RAILROAD WELL	13577	Hypochlorination, Post	Disinfection
CHLORINATOR FOR OLD CITY WELL	13578	Hypochlorination, Post	Disinfection
CHLORINATOR FOR SCHOOL WELL	17587	Hypochlorination, Post	Disinfection
CHLORINATION FOR SOUTH CITY WELL	3405	Innovative	Disinfection
CHLORINATION FOR SOUTH CITY WELL	3405	Hypochlorination, Post	Disinfection

1 - 6 of 6

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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