California Integrated Water Quality System (CIWQS 100.0) - Build Number: mainTrunk.mm.dd.yyyy.1


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	California Integrated Water Quality System Project (CIWQS)

Facility At-A-Glance Report

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Place ID 646986

General Information
Region	Place ID	Place Name	Place Type	Place Address	Place County
5F	646986	Mariposa Co YOSEMITE WEST CS	Collection_System	4639 Ben Hur Mariposa, CA, 95338	Mariposa

Related Parties

Party	Party Type	Party Name	Role	Classification	Relationship Start Date	Relationship End Date
652815	Person	Jason Lewis	Is A Data Submitter For		10/21/2025
638922	Person	John Luthey	Is Onsite Manager For		06/06/2025
638922	Person	John Luthey	Is A Data Submitter For		04/10/2023
525063	Person	Tony Souza	Is A Data Submitter For		11/08/2010	01/21/2016
524844	Person	Allen Toschi	Is Onsite Manager For		10/14/2010	07/25/2025
369851	Person	Darryl Nielsen	Is Onsite Manager For		10/14/2010
70303	Person	Dana Hertfelder	Is Onsite Manager For		03/20/2007	07/25/2025
27812	Organization	Mariposa Cnty DPW	Owner	County Agency	02/13/2007

Total Related Parties: 8

Regulatory Measures

Reg Measure ID	Reg Measure Type	Region	Program	Order No.	WDID	Effective Date	Expiration Date	Status	Amended?
320708	Enrollee - WDR	5F	SSOMUNISML	2022-0103-DWQ	5SSO11323	02/13/2007	05/02/2011	Active	N

Total Reg Measures: 1

Violations

Violation ID	Occurred Date	Violation Type	(-) Violation Description	Corrective Action	Status	Classification	Source
1133467	06/08/2024	SSOS	Type: Category 1 Spill; Collection System Maintenance Failure (specify below), Root Intrusion caused 25904 gallons of sewage to spill from Lateral Clean Out (Private) at Yosemite West CS to Drainage Conveyance System that discharges to surface water, Unpaved Surface	Repaired Facilities or Replaced Defect. We removed and replaced 14ft. of 6in. sewer main that had clogged due to root intrusion and a large amount of grit and rocks that had accumulated. We have sampled the stream both up and downstream and are awaiting results. Although there is no public access in the area, we have also cordoned off the spill area to limit any possible access while we perform disinfection, cleanup activities.	Violation	A	SSO
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.

Total Violations: 1

Priority Violations: 0

*Click the "(+/-) Violation Description" link to expand and contract the violation description.
*As of 5/20/2010, the Water Board's Enforcement Policy requires that all violations be classified as 1, 2 or 3, with class 1 being the highest. Prior to this, violations were simply classified as Yes or No. If a 123 classification has been assigned to a violation that occurred before this date, that classification data will be displayed instead of the Yes/No data.

Violation Types
SSOS = Sanitary Sewer Overflow/Spill/

Enforcement Actions

Enf Id	Enf Type	Enf Order No.	Effective Date	Status
382432	Notice of Violation		12/16/2011	Historical
378389	Notice of Violation		07/20/2010	Historical

Total Enf Actions: 2

Inspections

Attachment

Total Inspections: 0

Last Inspection: None

The current report was generated with data as of: 10/31/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.

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