Public Water System: Artesia Municipal 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: NM3520308
Type: Community water system
EPA Region: 06
Primary Service Area: Municipality
Primary Source: Ground water
Population Served: 14,000
Contact Information
LANDFAIR, BYRON
LANDFAIR, BYRON
612 N. ROSELAWN
ARTESIA, NM 88210

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   (1) 2015   (0)
strontium strontium

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).

strontium
Is this in your home's pipes?

Year Test Date MRL HRL Test Result
2014 2014-05-05 0.3 1500 2150
2014 2014-01-28 0.3 1500 2100
2014 2014-01-28 0.3 1500 2020
2014 2014-01-28 0.3 1500 2130
2014 2014-01-28 0.3 1500 2310
2014 2014-01-28 0.3 1500 2270
2014 2014-01-28 0.3 1500 2140
2013 2013-10-29 0.3 1500 2220
2013 2013-10-29 0.3 1500 2380
2013 2013-10-08 0.3 1500 2180
2013 2013-10-08 0.3 1500 2250
2013 2013-10-08 0.3 1500 2230
2013 2013-05-21 0.3 1500 2500
2013 2013-04-02 0.3 1500 2350
2013 2013-04-02 0.3 1500 2130
2013 2013-04-02 0.3 1500 2250
2013 2013-04-02 0.3 1500 1820
2013 2013-04-02 0.3 1500 2590
2013 2013-04-02 0.3 1500 2290
2013 2013-04-02 0.3 1500 2170
2013 2013-04-02 0.3 1500 1960
2013 2013-04-02 0.3 1500 2340
2013 2013-04-02 0.3 1500 2300

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
molybdenum 1 40 2.9665 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-05-05 1 40 2.73
2014 2014-01-28 1 40 2.66
2014 2014-01-28 1 40 2.61
2014 2014-01-28 1 40 2.95
2014 2014-01-28 1 40 2.89
2014 2014-01-28 1 40 2.91
2014 2014-01-28 1 40 2.56
2013 2013-10-29 1 40 2.69
2013 2013-10-29 1 40 3.16
2013 2013-10-08 1 40 2.36
2013 2013-10-08 1 40 2.44
2013 2013-10-08 1 40 3.2
2013 2013-05-21 1 40 3.56
2013 2013-04-02 1 40 3.53
2013 2013-04-02 1 40 3.67
2013 2013-04-02 1 40 2.57
2013 2013-04-02 1 40 3.57
2013 2013-04-02 1 40 3.52
2013 2013-04-02 1 40 2.87
2013 2013-04-02 1 40 3.36
2013 2013-04-02 1 40 2.78
2013 2013-04-02 1 40 2.86
2013 2013-04-02 1 40 2.78
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.2 140 < 0.2
2013 2013-10-08 0.2 140 < 0.2
2013 2013-10-08 0.2 140 < 0.2
2013 2013-10-08 0.2 140 < 0.2
2013 2013-10-08 0.2 140 < 0.2
2013 2013-10-08 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
2013 2013-04-02 0.2 140 < 0.2
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-05-05 1 70 < 1
2014 2014-01-28 1 70 < 1
2014 2014-01-28 1 70 < 1
2014 2014-01-28 1 70 < 1
2014 2014-01-28 1 70 < 1
2014 2014-01-28 1 70 < 1
2014 2014-01-28 1 70 < 1
2013 2013-10-29 1 70 < 1
2013 2013-10-29 1 70 < 1
2013 2013-10-08 1 70 < 1
2013 2013-10-08 1 70 < 1
2013 2013-10-08 1 70 < 1
2013 2013-05-21 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
2013 2013-04-02 1 70 < 1
vanadium 0.2 21 2.907 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-05-05 0.2 21 3.02
2014 2014-01-28 0.2 21 1.53
2014 2014-01-28 0.2 21 2.61
2014 2014-01-28 0.2 21 2.77
2014 2014-01-28 0.2 21 2.41
2014 2014-01-28 0.2 21 2.49
2014 2014-01-28 0.2 21 2.36
2013 2013-10-29 0.2 21 2.66
2013 2013-10-29 0.2 21 2.81
2013 2013-10-08 0.2 21 2.69
2013 2013-10-08 0.2 21 2.9
2013 2013-10-08 0.2 21 3.09
2013 2013-05-21 0.2 21 3.14
2013 2013-04-02 0.2 21 2.82
2013 2013-04-02 0.2 21 3.61
2013 2013-04-02 0.2 21 3.32
2013 2013-04-02 0.2 21 2.94
2013 2013-04-02 0.2 21 2.78
2013 2013-04-02 0.2 21 2.77
2013 2013-04-02 0.2 21 3.11
2013 2013-04-02 0.2 21 3.31
2013 2013-04-02 0.2 21 4.53
2013 2013-04-02 0.2 21 3.19
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.06 90 < 0.06
2013 2013-10-08 0.06 90 < 0.06
2013 2013-10-08 0.06 90 < 0.06
2013 2013-10-08 0.06 90 < 0.06
2013 2013-10-08 0.06 90 < 0.06
2013 2013-10-08 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
2013 2013-04-02 0.06 90 < 0.06
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.08 0 < 0.08
2013 2013-10-08 0.08 0 < 0.08
2013 2013-10-08 0.08 0 < 0.08
2013 2013-10-08 0.08 0 < 0.08
2013 2013-10-08 0.08 0 < 0.08
2013 2013-10-08 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
2013 2013-04-02 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.09 0 < 0.09
2013 2013-10-08 0.09 0 < 0.09
2013 2013-10-08 0.09 0 < 0.09
2013 2013-10-08 0.09 0 < 0.09
2013 2013-10-08 0.09 0 < 0.09
2013 2013-10-08 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
2013 2013-04-02 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.01 0 < 0.01
2013 2013-10-08 0.01 0 < 0.01
2013 2013-10-08 0.01 0 < 0.01
2013 2013-10-08 0.01 0 < 0.01
2013 2013-10-08 0.01 0 < 0.01
2013 2013-10-08 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
2013 2013-04-02 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 < 0.03
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-10-08 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
2013 2013-04-02 0.03 6.14 < 0.03
chromium-6 0.03 0 0.089 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.03 0 0.081
2013 2013-10-08 0.03 0 0.105
2013 2013-10-08 0.03 0 0.124
2013 2013-10-08 0.03 0 0.071
2013 2013-10-08 0.03 0 0.151
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 0.101
2013 2013-10-08 0.03 0 < 0.03
2013 2013-10-08 0.03 0 0.096
2013 2013-10-08 0.03 0 0.16
2013 2013-10-08 0.03 0 0.177
2013 2013-10-08 0.03 0 < 0.03
2013 2013-04-02 0.03 0 0.0964
2013 2013-04-02 0.03 0 0.0502
2013 2013-04-02 0.03 0 0.16
2013 2013-04-02 0.03 0 0.113
2013 2013-04-02 0.03 0 0.108
2013 2013-04-02 0.03 0 0.0465
2013 2013-04-02 0.03 0 0.0874
2013 2013-04-02 0.03 0 0.141
2013 2013-04-02 0.03 0 < 0.03
2013 2013-04-02 0.03 0 0.114
2013 2013-04-02 0.03 0 0.082
2013 2013-04-02 0.03 0 0.0704
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-10-08 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
2013 2013-04-02 0.1 0.0103 < 0.1
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-10-08 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
2013 2013-04-02 0.2 2.69 < 0.2
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-10-08 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
2013 2013-04-02 0.03 0.0004 < 0.03
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-10-08 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
2013 2013-04-02 0.07 0.35 < 0.07
chlorate 20 210 < 20 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-10-08 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
2013 2013-04-02 20 210 < 20
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-10-08 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
2013 2013-04-02 0.02 0.07 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-10-08 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
2013 2013-04-02 0.04 0.07 < 0.04
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-08 0.02 0 < 0.02
2013 2013-10-08 0.02 0 < 0.02
2013 2013-10-08 0.02 0 < 0.02
2013 2013-10-08 0.02 0 < 0.02
2013 2013-10-08 0.02 0 < 0.02
2013 2013-10-08 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
2013 2013-04-02 0.02 0 < 0.02
chromium 0.2 100 0.2365 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-05-05 0.2 100 0.251
2014 2014-01-28 0.2 100 0.583
2014 2014-01-28 0.2 100 < 0.2
2014 2014-01-28 0.2 100 < 0.2
2014 2014-01-28 0.2 100 < 0.2
2014 2014-01-28 0.2 100 < 0.2
2014 2014-01-28 0.2 100 0.307
2013 2013-10-29 0.2 100 0.391
2013 2013-10-29 0.2 100 0.394
2013 2013-10-08 0.2 100 0.241
2013 2013-10-08 0.2 100 0.298
2013 2013-10-08 0.2 100 0.437
2013 2013-05-21 0.2 100 0.637
2013 2013-04-02 0.2 100 1.15
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 < 0.2
2013 2013-04-02 0.2 100 0.751

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
NM13598 lead 2016-01-01 2018-12-31 0.0026mg/L
NM11315 lead 2011-01-01 2013-12-31 0.0018mg/L
NM9276 lead 2008-01-01 2010-12-31 0.00414mg/L
NM4943 lead 2006-01-01 2008-12-31 0.00279mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2017-09-01 - 2017-09-30 Revised Total Coliform Rule Maximum Contaminant Level Violation, E. coli (RTCR) Revised Total Coliform Rule Known
2017-07-01 - 2017-07-31 Revised Total Coliform Rule Maximum Contaminant Level Violation, E. coli (RTCR) Revised Total Coliform Rule Known
2015-07-01 - 2015-07-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2011-05-01 - 2011-05-31 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Returned to Compliance
2002-01-01 - 2010-12-31 Inorganic Chemicals Monitoring, Regular Asbestos Returned to Compliance
2009-11-01 - 2009-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2008-11-01 - 2008-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2004-03-01 - 2004-03-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2001-10-01 - 2001-10-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2001-09-01 - 2001-09-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2001-07-01 - 2001-07-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
1999-10-01 - 1999-10-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
1999-05-01 - 1999-05-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
1993-01-01 - 1993-08-20 Lead and Copper Rule Initial Tap Sampling for Pb and Cu Lead and Copper Rule Returned to Compliance
1992-07-01 - 1992-12-31 Lead and Copper Rule Initial Tap Sampling for Pb and Cu Lead and Copper Rule Returned to Compliance
2015-10-01 - N/A Lead and Copper Rule Follow-up Or Routine LCR Tap M/R Lead and Copper Rule Returned to Compliance
2017-09-17 - N/A Ground Water Rule Monitoring, Source Water (GWR) E. COLI Open
2017-09-10 - N/A Ground Water Rule Monitoring, Source Water (GWR) E. COLI Open
2016-03-25 - N/A Public Notice Rule Public Notification Violation for NPDWR Violation Public Notice Open
2015-09-06 - N/A Public Notice Rule Public Notification Violation for NPDWR Violation Public Notice Open

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.