TapGraded
?

FLAG CITY WATER SYSTEM

Stockton, CA · 135 served

FLAG CITY WATER SYSTEM serves 135 people in Stockton, CA. It has 0 health-based violations in the last 5 years. TapGraded has not yet graded this system.

Violation history (last 5 years)

No violations on record.

Get alerted when FLAG CITY WATER SYSTEM gets a violation

We'll only email you about this water system. Unsubscribe anytime.

Lead (Lead and Copper Rule)

EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).

90th-percentile lead sample 3 ppb
0 ppb EPA action level: 15 ppb

PFAS (UCMR5 occurrence data)

This system was not required to sample under UCMR5 (systems serving fewer than 3,300 people are mostly exempt).

System details

System type
Non-transient non-community water system
Water source
Ground water
Ownership
Local government
Service connections
41

Worried about what's in your tap?

See which water filters are certified to remove the contaminants found in your area.

Find a filter that matches your water

Frequently asked questions

Is Stockton, CA tap water safe to drink?

FLAG CITY WATER SYSTEM has 0 health-based violations in the last 5 years. TapGraded has not yet graded this system.

Does FLAG CITY WATER SYSTEM have lead in its water?

The most recent 90th-percentile lead sample is 3 ppb, versus the EPA action level of 15 ppb.

Has PFAS been detected in FLAG CITY WATER SYSTEM's water?

This system was not required to sample under UCMR5 (systems serving fewer than 3,300 people are mostly exempt).

Source: EPA SDWIS/ECHO · Data as of 2026Q2