Public water system · CA2010017
ActiveTesoro Viejo Master Mwc, Inc..
At a glance
Tesoro Viejo Master Mwc, Inc.. (PWSID CA2010017) is an active community water system in Madera County, California. It reports serving 3,885 people through 1,115 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,885
Service connections
1,115
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Tesoro Viejo Master Mwc, Inc.. compare with other water systems in Madera County?
By EPA's size categories, Tesoro Viejo Master Mwc, Inc.. is a medium system (3,301 to 10,000 people). Madera County has 202 active public water systems. Its population served is about 4.2 times the county average of 915 people per system, and accounts for 2.1% of the 184,760 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Tesoro Viejo Master Mwc, Inc.. is about 42% below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Tesoro Viejo Master Mwc, Inc..?
EPA lists Tesoro Viejo Master Mwc, Inc.. as privately owned. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 139 of the 202 active systems in Madera County (69%) are also privately owned.
Does Tesoro Viejo Master Mwc, Inc.. have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Tesoro Viejo Master Mwc, Inc... For the latest compliance status, check EPA ECHO for current compliance history.
Tesoro Viejo Master Mwc, Inc..: frequently asked questions
Who runs Tesoro Viejo Master Mwc, Inc..?
Tesoro Viejo Master Mwc, Inc.. (PWSID CA2010017) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Tesoro Viejo Master Mwc, Inc.. serve?
Tesoro Viejo Master Mwc, Inc.. reports serving 3,885 people through 1,115 service connections in Madera County, California.
Where does Tesoro Viejo Master Mwc, Inc.. get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Tesoro Viejo Master Mwc, Inc.. have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Tesoro Viejo Master Mwc, Inc..'s water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Tesoro Viejo Master Mwc, Inc..'s water quality report?
As a community water system, Tesoro Viejo Master Mwc, Inc.. must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Madera County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Madera | Madera | 66,560 | Community | Groundwater |
| Chowchilla City Water Dept | Madera | 13,916 | Community | Groundwater |
| Lupine Bass Lake | Madera | 11,930 | Transient non-community | Groundwater |
| Madera Valley Water Company | Madera | 6,494 | Community | Groundwater |
| Riverstone/Rootcreek Water District | Madera | 5,507 | Community | Groundwater |
| Yosemite Spring Park Util Co | Madera | 5,300 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Tesoro Viejo Master Mwc, Inc.., PWSID CA2010017, California”, https://aquacensus.com/water-systems/california/tesoro-viejo-master-mwc-inc-ca2010017 (data as of October 1, 2026).