Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CA3910012
PWS Name	CITY OF STOCKTON
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	191302
County Served	San Joaquin

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, Regular	Nitrate Rule	Nitrate	610013	Returned to Compliance	01-JAN-2024	31-DEC-2024	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	610009	Returned to Compliance	01-APR-2023	30-JUN-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	610008	Returned to Compliance	01-JAN-2023	31-MAR-2023	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	610011	Returned to Compliance	01-OCT-2021	-	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	610007	Returned to Compliance	01-MAR-2016	31-MAR-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	610005	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
Other	Notification, State	Total Coliform Rule	Coliform (TCR)	610004	Returned to Compliance	01-NOV-2005	30-NOV-2005	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	110003	Returned to Compliance	01-JUL-2001	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	10002	Returned to Compliance	01-DEC-1999	31-DEC-1999	Yes

1 - 9 of 9

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9810016	610013	SOX	State Compliance achieved	16-SEP-2025	State	-
9810017	610011	SOX	State Compliance achieved	10-JAN-2025	State	-
9810013	610009	SOX	State Compliance achieved	18-JUN-2024	State	System has returned to compliance with TTHM MCL
9810013	610008	SOX	State Compliance achieved	18-JUN-2024	State	System has returned to compliance with TTHM MCL
9810009	610004	SOX	State Compliance achieved	03-JUL-2019	State	-
9810007	610005	SOX	State Compliance achieved	28-MAR-2017	State	TTHM MCL Failure RTC
9810006	610007	SOX	State Compliance achieved	08-JUN-2016	State	CT Failure RTC
210005	110003	SFL	State Administrative/Compliance Order without penalty issued	21-NOV-2001	State	ENF_NO:03-10-01ENF-008;
9810008	10002	SOX	State Compliance achieved	31-JAN-2000	State	This TCR violation has been closed with this SOX enforcement record due to rTCR implementation on 4/1/2016.

1 - 9 of 9

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
STOCKTON EAST PLANT - RAW - ABANDONED	31269	Yes	Consecutive Connection	Surface water	Other	Inactive
VICTORY PARK - AGRICULTURAL	8504	Yes	Well	Ground water	Permanent	Inactive
CALDWELL PARK - AGRICULTURAL	8503	Yes	Well	Ground water	Permanent	Inactive
FRIEDBERGER PARK - AGRICULTURAL	8501	Yes	Well	Ground water	Permanent	Inactive
LEGION PARK - AGRICULTURAL	8500	Yes	Well	Ground water	Permanent	Inactive
OAK PARK EAST PUMP - AGRICULTURAL	8498	Yes	Well	Ground water	Permanent	Inactive
OAK PARK WEST PUMP - AGRICULTURAL	8497	Yes	Well	Ground water	Permanent	Inactive
WELL NO. 10R	53385	Yes	Well	Ground water	Permanent	Active
WELL NO. 21	13695	Yes	Well	Ground water	Permanent	Active
WELL NO. 19	13693	Yes	Well	Ground water	Permanent	Active
WELL NO. 18	13692	Yes	Well	Ground water	Permanent	Active
WELL NO. 03R	13685	Yes	Well	Ground water	Permanent	Active
WELL NO. 32	13684	Yes	Well	Ground water	Permanent	Active
WELL NO. 31	13683	Yes	Well	Ground water	Permanent	Active
WELL NO. 09 SSS	13681	Yes	Well	Ground water	Permanent	Active
WELL NO. 08 SSS - RAW TO IX	13680	Yes	Well	Ground water	Permanent	Active
WELL NO. 29	13679	Yes	Well	Ground water	Permanent	Active
WELL NO. 27	13660	Yes	Well	Ground water	Permanent	Active
WELL NO. 03 SSS	13519	Yes	Well	Ground water	Permanent	Active
WELL 05 - ANDERSON PARK - STANDBY	CA3910012025	Yes	Well	Ground water	Other	Inactive
WELL 02 - SWENSON PARK - AGRICULTURAL	CA3910012022	Yes	Well	Ground water	Other	Inactive
WALNUT PLANT 03 - STANDBY	CA3910012019	Yes	Well	Ground water	Other	Inactive
WALNUT PLANT 02	CA3910012018	Yes	Well	Ground water	Other	Inactive
COLUMBUS SQUARE - AGRICULTURAL	8502	Yes	Well	Ground water	Other	Inactive
MCKINLEY PARK - AGRICULTURAL	8499	Yes	Well	Ground water	Other	Inactive
WELL 02 - SWENSON PARK - DESTROYED	8492	Yes	Well	Ground water	Other	Inactive
WELL 01 - PARK WOODS - INACTIVE	24482	Yes	Well	Ground water	Other	Inactive
04 SSS - INACTIVE	24477	Yes	Well	Ground water	Other	Inactive
05 SSS - INACTIVE	24476	Yes	Well	Ground water	Other	Inactive
WALNUT PLANT 03 - DESTROYED	24473	Yes	Well	Ground water	Other	Inactive
WELL 04 - VILLA DORADO - INACTIVE	24472	Yes	Well	Ground water	Other	Inactive
WELL 05 - ANDERSON PARK - DESTROYED	24471	Yes	Well	Ground water	Other	Inactive
WELL 11 - PACIFIC OAKS - INACTIVE	24470	Yes	Well	Ground water	Other	Inactive
WELL 12 - PACIFIC OAKS AT LESLIE-DESTROY	24469	Yes	Well	Ground water	Other	Inactive
WELL 23 - OTTO - DESTROED	24467	Yes	Well	Ground water	Other	Inactive
WELL 16 - ROYAL OAKS - INACTIVE	24465	Yes	Well	Ground water	Other	Inactive
WELL 22 - SWAIN - DESTROYED	24460	Yes	Well	Ground water	Other	Inactive
WALNUT PLANT 04 - DESTROYED	19763	Yes	Well	Ground water	Other	Inactive
WELL 03 - LINCOLN VILLAGE - DESTROYED	19754	Yes	Well	Ground water	Other	Inactive
01A SSS - DESTROYED	19742	Yes	Well	Ground water	Other	Inactive
07 SSS - DESTROYED	19736	Yes	Well	Ground water	Other	Inactive
WELL 08 - EL DORADO - DESTROYED	19724	Yes	Well	Ground water	Other	Inactive
WALNUT PLANT 01 - DESTROYED XCLD	19723	Yes	Well	Ground water	Other	Inactive
STOCKTON POLICE - DESTROYED	19711	Yes	Well	Ground water	Other	Inactive
WELL 06 - CIMMERON - DESTROYED	19696	Yes	Well	Ground water	Other	Inactive
WELL 10 - DESTROYED XCLD	19678	Yes	Well	Ground water	Other	Inactive
WELL NO. 01 SSS - INACTIVE	13697	Yes	Well	Ground water	Other	Inactive
WELL NO. 20 - INACTIVE	13694	Yes	Well	Ground water	Other	Inactive
WELL 13 - TIFFANY -DESTROYED	13691	Yes	Well	Ground water	Other	Inactive
WELL 09 - SAN RAMON TERRACE - INACTIVE	13690	Yes	Well	Ground water	Other	Inactive

1 - 50 of 114

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
WELL NO. 28 - TREATED - XCLD	2278	Gaseous Chlorination, Post	Disinfection
WELL NO. 03 SSS - TREATED - XCLD	2279	Gaseous Chlorination, Post	Disinfection
WELL NO. 29 - TREATED - XCLD	2280	Gaseous Chlorination, Post	Disinfection
WELL NO. 08 SSS - IX COMBINED EFFLUENT	2281	Ion Exchange	Organics removal
WELL NO. 08 SSS - IX COMBINED EFFLUENT	2281	Gaseous Chlorination, Post	Disinfection
WELL NO. 09 SSS - TREATED - XCLD	2282	Gaseous Chlorination, Post	Disinfection
WELL NO. 30 - TREATED - XCLD	2283	Gaseous Chlorination, Post	Disinfection
WELL NO. 31 - TREATED - XCLD	2284	Gaseous Chlorination, Post	Disinfection
WELL NO. 32 - TREATED - XCLD	2285	Gaseous Chlorination, Post	Disinfection
WELL 24 - TREATED - INACTIVE	2310	Gaseous Chlorination, Post	Disinfection
WELL NO. 25 - TREATED - XCLD - INAC	2311	Gaseous Chlorination, Post	Disinfection
WELL NO. 26 - TREATED - XCLD - INAC	2312	Gaseous Chlorination, Post	Disinfection
WELL NO. 27 - TREATED - XCLD	2313	Hypochlorination, Pre	Disinfection
WELL NO. 03R - TREATED - XCLD	2318	Gaseous Chlorination, Post	Disinfection
WELL NO. 21 - TREATED - XCLD	2320	Gaseous Chlorination, Post	Disinfection
WELL 07 - TREATED - INACTIVE	2331	Gaseous Chlorination, Post	Disinfection
WELL NO. 02 SSS - TREATED - XCLD - STDBY	2333	Sequestration	Corrosion control
WELL NO. 02 SSS - TREATED - XCLD - STDBY	2333	Gaseous Chlorination, Post	Disinfection
WELL 09 - TREATED - INACTIVE	2344	Gaseous Chlorination, Post	Disinfection
WELL 13 - TREATED-DESTROYED	2346	Gaseous Chlorination, Post	Disinfection
WELL NO. 18 - TREATED - XCLD	2349	Gaseous Chlorination, Post	Disinfection
WELL NO. 19 - TREATED - XCLD	2350	Gaseous Chlorination, Post	Disinfection
WELL NO. 20 - TREATED - XCLD - INAC	2351	Gaseous Chlorination, Post	Disinfection
WELL NO. 01 SSS - TREATED - XCLD - INAC	2352	Sequestration	Corrosion control
WELL NO. 01 SSS - TREATED - XCLD - INAC	2352	Gaseous Chlorination, Post	Disinfection
WELL NO. 10R - TREATED - XCLD	53386	Gaseous Chlorination, Post	Disinfection
DWSP-SWTP-TREATED	57025	pH Adjustment, Post	Corrosion control
DWSP-SWTP-TREATED	57025	Coagulation	Particulate removal
DWSP-SWTP-TREATED	57025	Flocculation	Particulate removal
DWSP-SWTP-TREATED	57025	Sedimentation	Particulate removal
DWSP-SWTP-TREATED	57025	Filtration, Ultrafiltration	Particulate removal
DWSP-SWTP-TREATED	57025	Hypochlorination, Post	Disinfection
WELL 11 - TREATED - INACTIVE	7152	Sequestration	Corrosion control
WELL 11 - TREATED - INACTIVE	7152	Gaseous Chlorination, Post	Disinfection
WELL NO. 15 - TREATED - XCLD - STDBY	7154	Sequestration	Corrosion control
WELL NO. 15 - TREATED - XCLD - STDBY	7154	Gaseous Chlorination, Post	Disinfection
WELL 16 - TREATED - INACTIVE	7155	Sequestration	Corrosion control
WELL 16 - TREATED - INACTIVE	7155	Gaseous Chlorination, Post	Disinfection
WELL 22 - TREATED - DESTROYED XCLD	7156	Sequestration	Corrosion control
WELL 22 - TREATED - DESTROYED XCLD	7156	Gaseous Chlorination, Post	Disinfection
WELL 23 - TREATED - DESTROYED XCLD	7157	Sequestration	Corrosion control
WELL 23 - TREATED - DESTROYED XCLD	7157	Gaseous Chlorination, Post	Disinfection
WELL 04 - TREATED - INACTIVE	7159	Sequestration	Corrosion control
WELL 04 - TREATED - INACTIVE	7159	Gaseous Chlorination, Post	Disinfection
WELL 01 - TREATED - INACTIVE	7161	Sequestration	Corrosion control
WELL 01 - TREATED - INACTIVE	7161	Gaseous Chlorination, Post	Disinfection
WELL SSS5 - TREATED - INACTIVE XCLD	CA3910012053	Gaseous Chlorination, Post	Disinfection
WELL SSS5 - TREATED - INACTIVE XCLD	CA3910012053	Sequestration	Corrosion control
WELL 02 - TRTD DESTROYED -XCLD	CA3910012061	Gaseous Chlorination, Post	Disinfection
WELL 02 - TRTD DESTROYED -XCLD	CA3910012061	Sequestration	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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