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STANISLAUS UNION SCHOOL DIST

Modesto, CA · 390 served

STANISLAUS UNION SCHOOL DIST serves 390 people in Modesto, CA. It has 0 health-based violations in the last 5 years. TapGraded has not yet graded this system.

Violation history (last 5 years)

2023
2025
Health-based Monitoring / reporting

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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 0 ppb
0 ppb EPA action level: 15 ppb

Latest EPA Lead and Copper Rule 90th-percentile reading (monitoring period ending December 31, 2025).

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
5

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Frequently asked questions

Is Modesto, CA tap water safe to drink?

STANISLAUS UNION SCHOOL DIST has 0 health-based violations in the last 5 years. TapGraded has not yet graded this system. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.

Does STANISLAUS UNION SCHOOL DIST have lead in its water?

The most recent 90th-percentile lead sample is 0 ppb, versus the EPA action level of 15 ppb.

Has PFAS been detected in STANISLAUS UNION SCHOOL DIST'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

TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.