Who supplies water to San Diego?

SAN DIEGO, CITY OF, EPA public water system ID CA3710020, serving 1,385,379 people across 282,783 service connections.

San Diego, CA

Is San Diego tap water safe to drink?

Q: Is San Diego tap water safe to drink?

SAN DIEGO, CITY OF serves 1,385,379 people in San Diego from surface water. Its federal record shows 12 violations, 0 of them health-based. A violation record is a compliance history, not a water quality test — the contaminant levels themselves are in the utility's annual Consumer Confidence Report.

SAN DIEGO, CITY OF supplies 1,385,379 people here, drawing surface water. Here is its entire federal compliance record — and, just as importantly, what that record cannot tell you.

Kitchen tap running — San Diego municipal drinking water

People served

1,385,379

SAN DIEGO, CITY OF

Source

surface water

Violations on record

all time

Health-based

none on record

What this page is, and what it is not

This is the federal compliance record — what EPA has cited this utility for. It is not a water quality test. A system with no violations has not been shown to be clean; it has nothing reported, which is a weaker claim than it looks. The actual measured contaminant levels are in the utility’s annual Consumer Confidence Report, which every US utility must publish and which is not in this dataset.

The full record

Every violation, most recent first

From	Contaminant	What happened	Health-based
2020-04-01	EPA contaminant code 8000	missed required monitoring	no
2020-03-01	EPA contaminant code 8000	missed required monitoring	no
2020-02-01	EPA contaminant code 8000	missed required monitoring	no
2020-01-01	EPA contaminant code 8000	missed required monitoring	no
2019-12-01	EPA contaminant code 8000	missed required monitoring	no
2019-01-01	EPA contaminant code 4109	missed monitoring or reporting	no
2017-01-01	Nitrite (measured as Nitrogen)	missed monitoring or reporting	no
2017-01-01	Nitrite (measured as Nitrogen)	missed monitoring or reporting	no
2014-01-01	Nitrite (measured as Nitrogen)	missed monitoring or reporting	no
2014-01-01	EPA contaminant code 1041	missed monitoring or reporting	no
2013-01-01	Nitrite (measured as Nitrogen)	missed monitoring or reporting	no
2011-01-01	EPA contaminant code 1041	missed monitoring or reporting	no

What it means for filter choice

Every citation on this system is a monitoring or reporting failure rather than a health-based one — paperwork, not contamination. That is worth knowing before spending anything: it is not evidence you need a filter. Test your own tap for $14 and decide on the number, not on the utility's admin record.

What filtering costs here →This utility on EPA ECHO

Test before you spend

Fourteen dollars beats a compliance record

A federal record describes a utility. It cannot describe the pipe between the main and your kitchen, which is where lead usually comes from. Your own tap is the only thing that answers your own question.

HoneForest TDS meter

$13.97

4.5★ 16,400 reviews · 2,000+ bought last month

Tells you your dissolved-solids number in about four seconds, which is where every decision on this site should start.

Against it: TDS is not a safety measurement. It counts dissolved solids and cannot see lead, PFAS or bacteria. It tells you how hard your water is and whether a filter is still doing anything — nothing more. Anyone selling you a system on a TDS reading alone is misleading you.

Check price on Amazonchecked
2026-08-31

HM Digital TDS-3

$13.60

4.6★ 1,800 reviews · 1,000+ bought last month

The one that has been in service vans for fifteen years. Holds calibration better than the cheap ones.

Against it: Same limitation as every TDS meter, and it looks like it was designed in 2009 because it was.

Check price on Amazonchecked
2026-08-31

Source: US EPA Safe Drinking Water Information System, retrieved 2026-08-31 from data.epa.gov. Public water system CA3710020. Nothing on this page is written by hand — if a figure is not in EPA’s response, it does not appear here. All cities.