Public water system · CA3710750
ActiveNas North Island & Nab Coronado
At a glance
Nas North Island & Nab Coronado (PWSID CA3710750) is an active community water system in San Diego County, California. It reports serving 36,990 people through 1,415 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by the federal government. EPA's records list 4 violations for this system; all are health-based, and the most recent began in January 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
36,990
Service connections
1,415
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Nas North Island & Nab Coronado compare with other water systems in San Diego County?
By EPA's size categories, Nas North Island & Nab Coronado is a large system (10,001 to 100,000 people). San Diego County has 191 active public water systems. Its population served is about twice the county average of 19,427 people per system, and accounts for 1% 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 Nas North Island & Nab Coronado is about 5.5 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 Nas North Island & Nab Coronado?
EPA lists Nas North Island & Nab Coronado as owned by the federal 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. 16 of the 191 active systems in San Diego County (8.4%) are also owned by the federal government.
Does Nas North Island & Nab Coronado have drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in January 2008. The violations listed here began between April 2005 and January 2008. By type: 4 contaminant level above the legal limit. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 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 |
|---|---|---|---|---|
| 2008-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2006-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | 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.
Nas North Island & Nab Coronado: frequently asked questions
Who runs Nas North Island & Nab Coronado?
Nas North Island & Nab Coronado (PWSID CA3710750) is a community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Nas North Island & Nab Coronado serve?
Nas North Island & Nab Coronado reports serving 36,990 people through 1,415 service connections in San Diego County, California.
Where does Nas North Island & Nab Coronado 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 Nas North Island & Nab Coronado have any drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in January 2008. 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 Nas North Island & Nab Coronado'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; all are health-based, and the most recent began in January 2008. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Nas North Island & Nab Coronado's water quality report?
As a community water system, Nas North Island & Nab Coronado 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, “Nas North Island & Nab Coronado, PWSID CA3710750, California”, https://aquacensus.com/water-systems/california/nas-north-island-nab-coronado-ca3710750 (data as of October 1, 2026).