Public Water System: City Of Tustin's tap water quality report is the compilation of data collected from federal, state, and local government agencies, most prominently the EPA. We strive to populate the report with the latest data concerning water contaminants, lead and copper levels, and water quality violations. We only collect drinking water data from public water systems.

PWS Service Information
PWS ID: CA3010046
Type: Community water system
EPA Region: 09
Primary Service Area: Other Area
Primary Source: Surface water purchased
Population Served: 67,700
Contact Information
PO BOX 466
TUSTIN, CA 92781

This public water system services 2 zip codes in 1 municipality in 1 county.

Summary Results

A summary view of the the times a water contaminant was tested and found to exceed the level set by the EPA (the MCL).

We couldn't find any records of contaminants exceeding the regulated limits in your water.

Other Water Contaminants Tested

The following contaminants were tested and within national EPA guidelines.

The last mile of pipe makes a big difference, learn more about testing your water.

We couldn't find any records of contaminants in your water.

Lead and Copper Data

Lead and copper are recorded separately from other contaminants because of the Lead and Copper Rule. As with all other results, these are the findings at the water supply. Lead and copper can be — and often are — added to drinking water in between the water facility and a tap.

Sample ID Contaminant Sampling Start Date Sampling End Date Result
CA49030 lead 2013-01-01 2015-12-31 0mg/L
CA39508 lead 2010-01-01 2012-12-31 0.007mg/L
301004612264L lead 2012-01-01 2012-12-31 0.007mg/L
301004609266LT4 lead 2009-01-01 2009-12-31 0.01mg/L


Known violations of the Safe Drinking Water Act as recorded by the EPA.

Compliance Dates Rule Violation Type Contaminant Name Status
2006-11-01 - 2006-11-30 Total Coliform Rule Monitoring, Repeat Minor (TCR) Coliform (TCR) Returned to Compliance
1998-08-15 - 1998-09-16 Nitrates Maximum Contaminant Level Violation, Average Nitrate Returned to Compliance
1982-10-01 - 1982-10-31 Nitrates Maximum Contaminant Level Violation, Single Sample Nitrate Known
1979-10-30 - 1980-01-29 Nitrates Maximum Contaminant Level Violation, Single Sample Nitrate Known
2016-07-29 - N/A Ground Water Rule Monitoring, Source Water (GWR) E. COLI Returned to Compliance

What My Water Data Means

Water data isn't always easy to interpret, but by following the links on this page you should be able to have most of your questions answered. By clicking the name of a water contaminant or secondary substance you can learn about that specific substance. Ultimately this page should give you some insight towards learning if your water is safe, what water filter you should buy (if any), and how well your local water compares against other sources.


The origin of's water data is explained on our Data Sources page.

Why Is My Water Data Not More Recent?

The recency of the data for your ZIP code depends on the last your water source was tested, by a federal, state, or local agency. More information about the timing can be determined by learning about the dataset in question and seeing how often the EPA (other another governing body) mandated testing.