Patterson, City Of Water System

MyTapWater.org'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: CA5010017
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Ground water
Population Served: 22,560 		Contact Information
WILLETT, MIKE
WILLETT, MIKE
1 PLAZA
PATTERSON, CA 95363
[email protected]

This public water system services 1 municipality in 1 county.

Summary Results

A summary view of tests in which a water contaminant found to exceed the Maximum Contaminant Level (MCL) set by the EPA.

Maximum Contaminant Levels Exceeded (by year):

2013   (3) 2014   (0) 2015   (0) 2016   (0) 2017   (0) 2018   (0)
strontium
chlorate
1,2,3-trichloropropane

Contaminant Detailed Results

This a view of violations of maximum contaminant levels. Use the expanded view see result data for a drinking water contaminant, the minimum level that can be recognized in a test (MRL), and upper limit that is considered healthy (HRL).

strontium

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2013 2013-10-23 0.3 1500 1200
2013 2013-10-23 0.3 1500 2900
2013 2013-10-23 0.3 1500 3200
2013 2013-10-23 0.3 1500 1500
2013 2013-10-23 0.3 1500 2400
2013 2013-10-23 0.3 1500 1500
2013 2013-10-23 0.3 1500 1500
2013 2013-10-23 0.3 1500 2100
2013 2013-10-23 0.3 1500 1600
2013 2013-10-23 0.3 1500 1200
2013 2013-10-23 0.3 1500 1300
2013 2013-10-23 0.3 1500 1500
2013 2013-10-23 0.3 1500 2300
2013 2013-04-24 0.3 1500 1800
2013 2013-04-24 0.3 1500 2100
2013 2013-04-24 0.3 1500 2300
2013 2013-04-24 0.3 1500 1300
2013 2013-04-24 0.3 1500 2300
2013 2013-04-24 0.3 1500 1300
2013 2013-04-24 0.3 1500 1400
2013 2013-04-24 0.3 1500 2100
2013 2013-04-24 0.3 1500 1200
2013 2013-04-24 0.3 1500 1500
2013 2013-04-24 0.3 1500 1200
2013 2013-04-24 0.3 1500 1300
2013 2013-04-24 0.3 1500 2100

chlorate

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2013 2013-10-23 20 210 400
2013 2013-10-23 20 210 49
2013 2013-10-23 20 210 60
2013 2013-10-23 20 210 94
2013 2013-10-23 20 210 51
2013 2013-10-23 20 210 86
2013 2013-10-23 20 210 < 20
2013 2013-10-23 20 210 < 20
2013 2013-10-23 20 210 24
2013 2013-10-23 20 210 < 20
2013 2013-10-23 20 210 < 20
2013 2013-10-23 20 210 < 20
2013 2013-10-23 20 210 < 20
2013 2013-05-09 20 210 48
2013 2013-05-09 20 210 22
2013 2013-05-09 20 210 46
2013 2013-05-09 20 210 32
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 100
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 82
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 < 20
2013 2013-05-09 20 210 < 20

1,2,3-trichloropropane

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-10-23 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 0.1
2013 2013-04-24 0.03 0.0004 < 0.03
2013 2013-04-24 0.03 0.0004 < 0.03

Water Test And Filter Picks

Tip: Test your water at least once a year.


TapScore Water Test
A professional water test with including shipping to the lab.
Buy It Now

Aquasana 3-Stage Filter
Under-The-Sink System
Buy It Now

Faucet-Mounted Filter
A simple filter system for under $30
Buy It Now

Other Water Contaminants Tested

The following contaminants were tested and found to be within national EPA guidelines.

Contaminant MRLMinimum Reporting Level HRLHealth Risk Limit Avg Result
chromium 0.2 100 19.1923 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.2 100 22
2013 2013-10-23 0.2 100 17
2013 2013-10-23 0.2 100 18
2013 2013-10-23 0.2 100 19
2013 2013-10-23 0.2 100 18
2013 2013-10-23 0.2 100 26
2013 2013-10-23 0.2 100 20
2013 2013-10-23 0.2 100 34
2013 2013-10-23 0.2 100 18
2013 2013-10-23 0.2 100 17
2013 2013-10-23 0.2 100 20
2013 2013-10-23 0.2 100 17
2013 2013-10-23 0.2 100 16
2013 2013-04-24 0.2 100 25
2013 2013-04-24 0.2 100 16
2013 2013-04-24 0.2 100 17
2013 2013-04-24 0.2 100 19
2013 2013-04-24 0.2 100 16
2013 2013-04-24 0.2 100 20
2013 2013-04-24 0.2 100 21
2013 2013-04-24 0.2 100 16
2013 2013-04-24 0.2 100 17
2013 2013-04-24 0.2 100 17
2013 2013-04-24 0.2 100 19
2013 2013-04-24 0.2 100 18
2013 2013-04-24 0.2 100 16
[+] Expand Test Data
chromium-6 0.03 0 18.0154 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.03 0 17
2013 2013-10-23 0.03 0 17
2013 2013-10-23 0.03 0 16
2013 2013-10-23 0.03 0 19
2013 2013-10-23 0.03 0 16
2013 2013-10-23 0.03 0 19
2013 2013-10-23 0.03 0 18
2013 2013-10-23 0.03 0 26
2013 2013-10-23 0.03 0 17
2013 2013-10-23 0.03 0 15
2013 2013-10-23 0.03 0 18
2013 2013-10-23 0.03 0 18
2013 2013-10-23 0.03 0 17
2013 2013-04-24 0.03 0 16
2013 2013-04-24 0.03 0 20
2013 2013-04-24 0.03 0 18
2013 2013-04-24 0.03 0 22
2013 2013-04-24 0.03 0 18
2013 2013-04-24 0.03 0 20
2013 2013-04-24 0.03 0 24
2013 2013-04-24 0.03 0 19
2013 2013-04-24 0.03 0 19
2013 2013-04-24 0.03 0 3.4
2013 2013-04-24 0.03 0 22
2013 2013-04-24 0.03 0 18
2013 2013-04-24 0.03 0 16
[+] Expand Test Data
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-10-23 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
2013 2013-04-24 1 70 < 1
[+] Expand Test Data
molybdenum 1 40 1.3385 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 1 40 1.1
2013 2013-10-23 1 40 < 1
2013 2013-10-23 1 40 < 1
2013 2013-10-23 1 40 2.9
2013 2013-10-23 1 40 < 1
2013 2013-10-23 1 40 2.8
2013 2013-10-23 1 40 3
2013 2013-10-23 1 40 1.7
2013 2013-10-23 1 40 2.9
2013 2013-10-23 1 40 1.2
2013 2013-10-23 1 40 1.3
2013 2013-10-23 1 40 2.5
2013 2013-10-23 1 40 < 1
2013 2013-04-24 1 40 < 1
2013 2013-04-24 1 40 1.3
2013 2013-04-24 1 40 < 1
2013 2013-04-24 1 40 2.9
2013 2013-04-24 1 40 < 1
2013 2013-04-24 1 40 2.3
2013 2013-04-24 1 40 3.2
2013 2013-04-24 1 40 < 1
2013 2013-04-24 1 40 1.6
2013 2013-04-24 1 40 < 1
2013 2013-04-24 1 40 1.2
2013 2013-04-24 1 40 2.9
2013 2013-04-24 1 40 < 1
[+] Expand Test Data
vanadium 0.2 21 8.7923 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.2 21 13
2013 2013-10-23 0.2 21 9
2013 2013-10-23 0.2 21 9.7
2013 2013-10-23 0.2 21 7.5
2013 2013-10-23 0.2 21 10
2013 2013-10-23 0.2 21 12
2013 2013-10-23 0.2 21 7.9
2013 2013-10-23 0.2 21 5.1
2013 2013-10-23 0.2 21 4.2
2013 2013-10-23 0.2 21 12
2013 2013-10-23 0.2 21 11
2013 2013-10-23 0.2 21 6.3
2013 2013-10-23 0.2 21 8.9
2013 2013-04-24 0.2 21 11
2013 2013-04-24 0.2 21 8.9
2013 2013-04-24 0.2 21 9.4
2013 2013-04-24 0.2 21 6.8
2013 2013-04-24 0.2 21 8.9
2013 2013-04-24 0.2 21 8.9
2013 2013-04-24 0.2 21 7.6
2013 2013-04-24 0.2 21 8.8
2013 2013-04-24 0.2 21 6.9
2013 2013-04-24 0.2 21 10
2013 2013-04-24 0.2 21 10
2013 2013-04-24 0.2 21 5.9
2013 2013-04-24 0.2 21 8.9
[+] Expand Test Data
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-10-23 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
2013 2013-04-24 0.03 6.14 < 0.03
[+] Expand Test Data
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-10-23 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
2013 2013-04-24 0.1 0.0103 < 0.1
[+] Expand Test Data
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2015 2015-09-15 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
2013 2013-04-24 0.07 0.35 < 0.07
[+] Expand Test Data
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-10-23 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
2013 2013-04-24 0.2 140 < 0.2
[+] Expand Test Data
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-10-23 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
2013 2013-04-24 0.2 2.69 < 0.2
[+] Expand Test Data
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-10-23 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
2013 2013-04-24 0.06 90 < 0.06
[+] Expand Test Data
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-10-23 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
2013 2013-04-24 0.08 0 < 0.08
[+] Expand Test Data
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-10-23 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
2013 2013-04-24 0.09 0 < 0.09
[+] Expand Test Data
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-10-23 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
2013 2013-04-24 0.01 0 < 0.01
[+] Expand Test Data
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-10-23 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
2013 2013-04-24 0.03 0 < 0.03
[+] Expand Test Data
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-10-23 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
2013 2013-04-24 0.02 0 < 0.02
[+] Expand Test Data
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-10-23 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
2013 2013-04-24 0.02 0.07 < 0.02
[+] Expand Test Data
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-10-23 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
2013 2013-04-24 0.04 0.07 < 0.04
[+] Expand Test Data

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 level. Lead and copper can be — and often are — deposited in drinking water in between the water facility and your tap.

Sample ID Contaminant Sampling Start Date Sampling End Date Result
CA62677 lead 2016-01-01 2018-12-31 0.0017mg/L
CA49049 lead 2013-01-01 2015-12-31 0mg/L
501001712250L lead 2012-01-01 2012-12-31 0.0006mg/L
CA37671 lead 2010-01-01 2012-12-31 0.0006mg/L
501001709244L lead 2009-01-01 2009-12-31 0.0018mg/L

Violations

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

Compliance Dates Rule Violation Type Contaminant Name Status
2007-01-01 - 2007-03-31 Nitrates Maximum Contaminant Level Violation, Average Nitrate Returned to Compliance
2003-06-01 - 2003-06-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
- N/A Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
- N/A Miscellaneous Notification, Public - Known

Local Water Testing

Find a lab in your area so you can get your tap or well water tested. This list contains both governmental and private labs, all of which are EPA-certified for drinking water testing.

Lab Location Zip Code
Castle Analytical Laboratory Atwater, CA 95301
Aqualab Twain Harte, CA 95383
Brelje and Race Laboratories, Inc. Santa Rosa, CA 95404

Water Bill Information

Convenient information about your water service.

Unable to identify any billing information about Patterson, City Of (CA5010017).

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.

Sources

The origin of MyTapWater.org'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.