Public Water System: Big Valley Rancheria Water District'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: 090605164
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Ground water
Population Served: 3,135
Contact Information
Big Valley Band of Pomo Indians
Anthony Jack
2726 Mission Rancheria Road
Lakeport, CA 95453

This public water system services .

We could not find test result data for Big Valley Rancheria Water District.

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
09060516417503444062 lead 2017-01-01 2017-06-30 =0.03mg/L
09060516417503442594 lead 2016-07-01 2016-12-31 =0.041mg/L
09060516417503441530 lead 2016-01-01 2016-06-30 =0.013mg/L
09060516417123924 lead 2015-07-01 2015-12-31 =0.039mg/L
09060516417117731 lead 2015-01-01 2015-06-30 =0.012mg/L
09060516423117730 copper 2014-07-01 2014-12-31 =1.7mg/L
09060516417117730 lead 2014-07-01 2014-12-31 =0.0079mg/L
09060516423117729 copper 2011-01-01 2013-12-31 =1.7mg/L
09060516417117726 lead 2011-01-01 2013-12-31 =0.0244mg/L
09060516417117727 lead 2011-01-01 2013-12-31 =0.00666mg/L
09060516417117728 lead 2011-01-01 2013-12-31 =0.0219mg/L
09060516417117729 lead 2011-01-01 2013-12-31 =0.014mg/L
0906051641712/31/106 lead 2008-01-01 2010-12-31 =0.0628mg/L
0906051641712/31/105 lead 2008-01-01 2010-12-31 =0.0218mg/L
0906051642312/31/105 copper 2008-01-01 2010-12-31 =2.06mg/L
09060516423117724 copper 2008-01-01 2010-12-31 =2.06mg/L
09060516423117725 copper 2008-01-01 2010-12-31 =1.74mg/L
09060516417117724 lead 2008-01-01 2010-12-31 =0.0218mg/L
09060516417117725 lead 2008-01-01 2010-12-31 =0.0628mg/L
0906051642312/31/106 copper 2008-01-01 2010-12-31 =1.74mg/L
0906051641712/31/094 lead 2009-01-01 2009-12-31 =0.0554mg/L
0906051642312/31/094 copper 2009-01-01 2009-12-31 =2.93mg/L
09060516423117732 copper 2009-01-01 2009-12-31 =2.93mg/L
09060516417117732 lead 2009-01-01 2009-12-31 =0.0554mg/L
09060516423117723 copper 2008-01-01 2008-12-31 =3.26mg/L
0906051641712/31/083 lead 2008-01-01 2008-12-31 =0.1133mg/L
0906051642312/31/083 copper 2008-01-01 2008-12-31 =3.26mg/L
09060516417117723 lead 2008-01-01 2008-12-31 =0.1133mg/L


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

Compliance Dates Rule Violation Type Contaminant Name Status
2004-05-01 - 2004-05-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) 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.