Public water system · CA3710005
ActiveCarlsbad Mwd
At a glance
Carlsbad Mwd (PWSID CA3710005) is an active community water system in San Diego County, California. It reports serving 95,158 people through 28,260 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
95,158
Service connections
28,260
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Carlsbad Mwd compare with other water systems in San Diego County?
By EPA's size categories, Carlsbad Mwd is a large system (10,001 to 100,000 people). San Diego County has 191 active public water systems. Its population served is about 4.9 times the county average of 19,427 people per system, and accounts for 2.6% of the 3,710,459 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 Carlsbad Mwd is about 14 times 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Carlsbad Mwd?
EPA lists Carlsbad Mwd as owned by a local government. 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. 58 of the 191 active systems in San Diego County (30%) are also owned by a local government.
Does Carlsbad Mwd 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 Carlsbad Mwd. For the latest compliance status, check EPA ECHO for current compliance history.
Carlsbad Mwd: frequently asked questions
Who runs Carlsbad Mwd?
Carlsbad Mwd (PWSID CA3710005) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Carlsbad Mwd serve?
Carlsbad Mwd reports serving 95,158 people through 28,260 service connections in San Diego County, California.
Where does Carlsbad Mwd get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Carlsbad Mwd have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Carlsbad Mwd'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 Carlsbad Mwd's water quality report?
As a community water system, Carlsbad Mwd 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 San Diego County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| San Diego, City of | San Diego | 1,385,379 | Community | Surface water |
| Helix Water District | San Diego | 277,668 | Community | Surface water |
| Otay Water District | San Diego | 238,008 | Community | Purchased surface water |
| Sweetwater Authority | San Diego | 191,282 | Community | Surface water |
| Oceanside, City of | San Diego | 171,483 | Community | Purchased surface water |
| Escondido, City of | San Diego | 137,044 | Community | Surface water |
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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, “Carlsbad Mwd, PWSID CA3710005, California”, https://aquacensus.com/water-systems/california/carlsbad-mwd-ca3710005 (data as of October 1, 2026).