Public Water System: Golden State Water Co. - Cordova

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: CA3410015
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Surface water
Population Served: 47,810
Contact Information
SCHUBERT, PAUL
SCHUBERT, PAUL
3005 GOLD CANAL DR
RANCHO CORDOVA, CA 95670-6129

This public water system services 1 zip code 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).

Maximum Contaminant Levels Exceeded (by year):

2013   (1) 2014   (0) 2015   (0)
chlorate

Contaminant Detailed Results


This a view of violations of maximum contaminant levels. In the expanded view you can see each know test date for a given contaminant, the result of the test, the minimum level that can be recognized in a test (MRL), and upper limit that is considered healthy (HRL).

chlorate
Is this in your home's pipes?

Year Test Date MRL HRL Test Result
2014 2014-03-25 20 210 < 20
2014 2014-03-25 20 210 < 20
2014 2014-03-25 20 210 86
2013 2013-12-10 20 210 < 20
2013 2013-12-10 20 210 59
2013 2013-12-10 20 210 57
2013 2013-12-10 20 210 130
2013 2013-12-10 20 210 64
2013 2013-12-10 20 210 400
2013 2013-12-10 20 210 150
2013 2013-12-10 20 210 100
2013 2013-09-17 20 210 < 20
2013 2013-09-17 20 210 160
2013 2013-09-17 20 210 < 20
2013 2013-06-18 20 210 < 20
2013 2013-06-18 20 210 120
2013 2013-06-18 20 210 35
2013 2013-06-18 20 210 120
2013 2013-06-18 20 210 99
2013 2013-06-18 20 210 < 20
2013 2013-06-18 20 210 220
2013 2013-06-18 20 210 280
2013 2013-06-18 20 210 150

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.

Contaminant MRL HRL Avg Result
vanadium 0.2 21 3.5235 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.2 21 0.26
2014 2014-03-25 0.2 21 0.4
2014 2014-03-25 0.2 21 < 0.2
2013 2013-12-10 0.2 21 5.8
2013 2013-12-10 0.2 21 3
2013 2013-12-10 0.2 21 3
2013 2013-12-10 0.2 21 4
2013 2013-12-10 0.2 21 3.2
2013 2013-12-10 0.2 21 5.7
2013 2013-12-10 0.2 21 4.7
2013 2013-12-10 0.2 21 2.5
2013 2013-09-17 0.2 21 0.51
2013 2013-09-17 0.2 21 0.43
2013 2013-09-17 0.2 21 < 0.2
2013 2013-06-18 0.2 21 0.84
2013 2013-06-18 0.2 21 7.4
2013 2013-06-18 0.2 21 2.5
2013 2013-06-18 0.2 21 3
2013 2013-06-18 0.2 21 5.2
2013 2013-06-18 0.2 21 1.6
2013 2013-06-18 0.2 21 10
2013 2013-06-18 0.2 21 11
2013 2013-06-18 0.2 21 6
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.04 0.07 < 0.04
2014 2014-03-25 0.04 0.07 < 0.04
2013 2013-12-10 0.04 0.07 < 0.04
2013 2013-12-10 0.04 0.07 < 0.04
2013 2013-12-10 0.04 0.07 < 0.04
2013 2013-12-10 0.04 0.07 < 0.04
2013 2013-12-10 0.04 0.07 < 0.04
2013 2013-09-17 0.04 0.07 < 0.04
2013 2013-09-17 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
2013 2013-06-18 0.04 0.07 < 0.04
strontium 0.3 1500 240.7826 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.3 1500 49
2014 2014-03-25 0.3 1500 54
2014 2014-03-25 0.3 1500 110
2013 2013-12-10 0.3 1500 170
2013 2013-12-10 0.3 1500 190
2013 2013-12-10 0.3 1500 160
2013 2013-12-10 0.3 1500 330
2013 2013-12-10 0.3 1500 150
2013 2013-12-10 0.3 1500 440
2013 2013-12-10 0.3 1500 400
2013 2013-12-10 0.3 1500 91
2013 2013-09-17 0.3 1500 49
2013 2013-09-17 0.3 1500 120
2013 2013-09-17 0.3 1500 56
2013 2013-06-18 0.3 1500 89
2013 2013-06-18 0.3 1500 510
2013 2013-06-18 0.3 1500 100
2013 2013-06-18 0.3 1500 230
2013 2013-06-18 0.3 1500 180
2013 2013-06-18 0.3 1500 180
2013 2013-06-18 0.3 1500 890
2013 2013-06-18 0.3 1500 830
2013 2013-06-18 0.3 1500 160
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.03 6.14 < 0.03
2014 2014-03-25 0.03 6.14 < 0.03
2013 2013-12-10 0.03 6.14 < 0.03
2013 2013-12-10 0.03 6.14 < 0.03
2013 2013-12-10 0.03 6.14 < 0.03
2013 2013-12-10 0.03 6.14 < 0.03
2013 2013-12-10 0.03 6.14 < 0.03
2013 2013-09-17 0.03 6.14 < 0.03
2013 2013-09-17 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
2013 2013-06-18 0.03 6.14 < 0.03
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.02 0.07 < 0.02
2014 2014-03-25 0.02 0.07 < 0.02
2013 2013-12-10 0.02 0.07 < 0.02
2013 2013-12-10 0.02 0.07 < 0.02
2013 2013-12-10 0.02 0.07 < 0.02
2013 2013-12-10 0.02 0.07 < 0.02
2013 2013-12-10 0.02 0.07 < 0.02
2013 2013-09-17 0.02 0.07 < 0.02
2013 2013-09-17 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
2013 2013-06-18 0.02 0.07 < 0.02
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.03 0.0004 < 0.03
2014 2014-03-25 0.03 0.0004 < 0.03
2013 2013-12-10 0.03 0.0004 < 0.03
2013 2013-12-10 0.03 0.0004 < 0.03
2013 2013-12-10 0.03 0.0004 < 0.03
2013 2013-12-10 0.03 0.0004 < 0.03
2013 2013-12-10 0.03 0.0004 < 0.03
2013 2013-09-17 0.03 0.0004 < 0.03
2013 2013-09-17 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
2013 2013-06-18 0.03 0.0004 < 0.03
chromium 0.2 100 0.9504 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.2 100 < 0.2
2014 2014-03-25 0.2 100 < 0.2
2014 2014-03-25 0.2 100 < 0.2
2013 2013-12-10 0.2 100 0.43
2013 2013-12-10 0.2 100 0.39
2013 2013-12-10 0.2 100 1.2
2013 2013-12-10 0.2 100 0.38
2013 2013-12-10 0.2 100 0.4
2013 2013-12-10 0.2 100 2.6
2013 2013-12-10 0.2 100 1.6
2013 2013-12-10 0.2 100 0.32
2013 2013-09-17 0.2 100 < 0.2
2013 2013-09-17 0.2 100 < 0.2
2013 2013-09-17 0.2 100 < 0.2
2013 2013-06-18 0.2 100 0.56
2013 2013-06-18 0.2 100 1.2
2013 2013-06-18 0.2 100 0.3
2013 2013-06-18 0.2 100 0.71
2013 2013-06-18 0.2 100 1.8
2013 2013-06-18 0.2 100 0.61
2013 2013-06-18 0.2 100 4.8
2013 2013-06-18 0.2 100 4
2013 2013-06-18 0.2 100 0.56
molybdenum 1 40 0.0565 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 1 40 < 1
2014 2014-03-25 1 40 < 1
2014 2014-03-25 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-12-10 1 40 < 1
2013 2013-09-17 1 40 < 1
2013 2013-09-17 1 40 < 1
2013 2013-09-17 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 1.3
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
2013 2013-06-18 1 40 < 1
1,4-dioxane 0.07 0.35 0.0247 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.07 0.35 < 0.07
2014 2014-03-25 0.07 0.35 < 0.07
2013 2013-12-10 0.07 0.35 < 0.07
2013 2013-12-10 0.07 0.35 < 0.07
2013 2013-12-10 0.07 0.35 0.17
2013 2013-12-10 0.07 0.35 < 0.07
2013 2013-12-10 0.07 0.35 < 0.07
2013 2013-09-17 0.07 0.35 < 0.07
2013 2013-09-17 0.07 0.35 < 0.07
2013 2013-06-18 0.07 0.35 < 0.07
2013 2013-06-18 0.07 0.35 < 0.07
2013 2013-06-18 0.07 0.35 < 0.07
2013 2013-06-18 0.07 0.35 0.2
2013 2013-06-18 0.07 0.35 < 0.07
2013 2013-06-18 0.07 0.35 < 0.07
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.2 140 < 0.2
2014 2014-03-25 0.2 140 < 0.2
2013 2013-12-10 0.2 140 < 0.2
2013 2013-12-10 0.2 140 < 0.2
2013 2013-12-10 0.2 140 < 0.2
2013 2013-12-10 0.2 140 < 0.2
2013 2013-12-10 0.2 140 < 0.2
2013 2013-09-17 0.2 140 < 0.2
2013 2013-09-17 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
2013 2013-06-18 0.2 140 < 0.2
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 1 70 < 1
2014 2014-03-25 1 70 < 1
2014 2014-03-25 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-12-10 1 70 < 1
2013 2013-09-17 1 70 < 1
2013 2013-09-17 1 70 < 1
2013 2013-09-17 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
2013 2013-06-18 1 70 < 1
chromium-6 0.03 0 0.6152 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.03 0 0.069
2014 2014-03-25 0.03 0 0.076
2014 2014-03-25 0.03 0 < 0.03
2013 2013-12-10 0.03 0 0.35
2013 2013-12-10 0.03 0 0.39
2013 2013-12-10 0.03 0 1.4
2013 2013-12-10 0.03 0 0.3
2013 2013-12-10 0.03 0 0.32
2013 2013-12-10 0.03 0 1.6
2013 2013-12-10 0.03 0 2.9
2013 2013-12-10 0.03 0 0.11
2013 2013-09-17 0.03 0 0.066
2013 2013-09-17 0.03 0 < 0.03
2013 2013-09-17 0.03 0 0.086
2013 2013-06-18 0.03 0 0.072
2013 2013-06-18 0.03 0 0.46
2013 2013-06-18 0.03 0 0.15
2013 2013-06-18 0.03 0 0.86
2013 2013-06-18 0.03 0 0.32
2013 2013-06-18 0.03 0 0.11
2013 2013-06-18 0.03 0 1.6
2013 2013-06-18 0.03 0 2.8
2013 2013-06-18 0.03 0 0.11
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.09 0 < 0.09
2014 2014-03-25 0.09 0 < 0.09
2013 2013-12-10 0.09 0 < 0.09
2013 2013-12-10 0.09 0 < 0.09
2013 2013-12-10 0.09 0 < 0.09
2013 2013-12-10 0.09 0 < 0.09
2013 2013-12-10 0.09 0 < 0.09
2013 2013-09-17 0.09 0 < 0.09
2013 2013-09-17 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
2013 2013-06-18 0.09 0 < 0.09
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.06 90 < 0.06
2014 2014-03-25 0.06 90 < 0.06
2013 2013-12-10 0.06 90 < 0.06
2013 2013-12-10 0.06 90 < 0.06
2013 2013-12-10 0.06 90 < 0.06
2013 2013-12-10 0.06 90 < 0.06
2013 2013-12-10 0.06 90 < 0.06
2013 2013-09-17 0.06 90 < 0.06
2013 2013-09-17 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
2013 2013-06-18 0.06 90 < 0.06
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.1 0.0103 < 0.1
2014 2014-03-25 0.1 0.0103 < 0.1
2013 2013-12-10 0.1 0.0103 < 0.1
2013 2013-12-10 0.1 0.0103 < 0.1
2013 2013-12-10 0.1 0.0103 < 0.1
2013 2013-12-10 0.1 0.0103 < 0.1
2013 2013-12-10 0.1 0.0103 < 0.1
2013 2013-09-17 0.1 0.0103 < 0.1
2013 2013-09-17 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
2013 2013-06-18 0.1 0.0103 < 0.1
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.08 0 < 0.08
2014 2014-03-25 0.08 0 < 0.08
2013 2013-12-10 0.08 0 < 0.08
2013 2013-12-10 0.08 0 < 0.08
2013 2013-12-10 0.08 0 < 0.08
2013 2013-12-10 0.08 0 < 0.08
2013 2013-12-10 0.08 0 < 0.08
2013 2013-09-17 0.08 0 < 0.08
2013 2013-09-17 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
2013 2013-06-18 0.08 0 < 0.08
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.01 0 < 0.01
2014 2014-03-25 0.01 0 < 0.01
2013 2013-12-10 0.01 0 < 0.01
2013 2013-12-10 0.01 0 < 0.01
2013 2013-12-10 0.01 0 < 0.01
2013 2013-12-10 0.01 0 < 0.01
2013 2013-12-10 0.01 0 < 0.01
2013 2013-09-17 0.01 0 < 0.01
2013 2013-09-17 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
2013 2013-06-18 0.01 0 < 0.01
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.2 2.69 < 0.2
2014 2014-03-25 0.2 2.69 < 0.2
2013 2013-12-10 0.2 2.69 < 0.2
2013 2013-12-10 0.2 2.69 < 0.2
2013 2013-12-10 0.2 2.69 < 0.2
2013 2013-12-10 0.2 2.69 < 0.2
2013 2013-12-10 0.2 2.69 < 0.2
2013 2013-09-17 0.2 2.69 < 0.2
2013 2013-09-17 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
2013 2013-06-18 0.2 2.69 < 0.2
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.02 0 < 0.02
2014 2014-03-25 0.02 0 < 0.02
2013 2013-12-10 0.02 0 < 0.02
2013 2013-12-10 0.02 0 < 0.02
2013 2013-12-10 0.02 0 < 0.02
2013 2013-12-10 0.02 0 < 0.02
2013 2013-12-10 0.02 0 < 0.02
2013 2013-09-17 0.02 0 < 0.02
2013 2013-09-17 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
2013 2013-06-18 0.02 0 < 0.02
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-03-25 0.03 0 < 0.03
2014 2014-03-25 0.03 0 < 0.03
2013 2013-12-10 0.03 0 < 0.03
2013 2013-12-10 0.03 0 < 0.03
2013 2013-12-10 0.03 0 < 0.03
2013 2013-12-10 0.03 0 < 0.03
2013 2013-12-10 0.03 0 < 0.03
2013 2013-09-17 0.03 0 < 0.03
2013 2013-09-17 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03
2013 2013-06-18 0.03 0 < 0.03

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
CA58654 lead 2015-01-01 2017-12-31 0mg/L
CA49587 lead 2014-01-01 2016-12-31 0.0051mg/L
341001508225L lead 2008-01-01 2008-12-31 0.0029mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2014-07-01 - 2014-07-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2006-06-01 - 2006-06-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2006-03-01 - 2006-03-31 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance
2005-04-01 - 2005-04-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
1997-08-01 - 1997-08-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
1992-07-01 - 1992-07-31 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule 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.

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.