Public water system · CA1910124
ActivePasadena Water and Power
At a glance
Pasadena Water and Power (PWSID CA1910124) is an active community water system in Los Angeles County, California. It reports serving 164,344 people through 38,522 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in April 1999.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
164,344
Service connections
38,522
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Pasadena Water and Power compare with other water systems in Los Angeles County?
By EPA's size categories, Pasadena Water and Power is a very large system (more than 100,000 people). Los Angeles County has 275 active public water systems. Its population served is about 4.5 times the county average of 36,762 people per system, and accounts for 1.6% of the 10,109,668 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 Pasadena Water and Power is about 25 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 Pasadena Water and Power?
EPA lists Pasadena Water and Power 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. 100 of the 275 active systems in Los Angeles County (36%) are also owned by a local government.
Does Pasadena Water and Power have drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in April 1999. The violations listed here began between September 1992 and April 1999. By type: 2 contaminant level above the legal limit, 1 monitoring and reporting and 1 required treatment not met. The contaminant or rule involved most often is Nitrate (2 of them). EPA lists 4 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1999-04-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Nitratecode 1040 | No | Resolved |
| 1999-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 1993-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1992-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 4 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Pasadena Water and Power: frequently asked questions
Who runs Pasadena Water and Power?
Pasadena Water and Power (PWSID CA1910124) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Pasadena Water and Power serve?
Pasadena Water and Power reports serving 164,344 people through 38,522 service connections in Los Angeles County, California.
Where does Pasadena Water and Power 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 Pasadena Water and Power have any drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in April 1999. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Pasadena Water and Power'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 records list 4 violations for this system; 3 are health-based, and the most recent began in April 1999. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Pasadena Water and Power's water quality report?
As a community water system, Pasadena Water and Power 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 Los Angeles County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Los Angeles-City, Dept. of Water & Power | Los Angeles | 3,875,566 | Community | Surface water |
| Long Beach Utilities Department | Los Angeles | 466,772 | Community | Purchased surface water |
| Santa Clarita Valley Water Agency | Los Angeles | 294,090 | Community | Surface water |
| Gswc - Southwest | Los Angeles | 277,740 | Community | Purchased surface water |
| San Gabriel Valley Water Co.-El Monte | Los Angeles | 248,000 | Community | Groundwater |
| Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | Los Angeles | 208,129 | Community | Purchased 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, “Pasadena Water and Power, PWSID CA1910124, California”, https://aquacensus.com/water-systems/california/pasadena-water-and-power-ca1910124 (data as of October 1, 2026).