Montville Twp Mua 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: NJ1421003
Type: Community water system
EPA Region: 02
Primary Service Area: Residential Area
Primary Source: Surface water purchased
Population Served: 22,000
Contact Information
MAZZACARRO, TOM
MAZZACARRO, TOM
195 CHANGEBRIDGE ROAD
MONTVILLE, NJ 07045

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   (0) 2014   (0) 2015   (0) 2016   (0) 2017   (0) 2018   (2)
anatoxin-a
cylindrospermopsin

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).

anatoxin-a

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.03 0.00 < 0.03
2018 2018-06-25 0.03 0.00 < 0.03
2018 2018-06-11 0.03 0.00 < 0.03

cylindrospermopsin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.09 0.00 < 0.09
2018 2018-06-25 0.09 0.00 < 0.09
2018 2018-06-11 0.09 0.00 < 0.09

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
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.03 6.14 < 0.03
2015 2015-04-13 0.03 6.14 < 0.03
2015 2015-01-13 0.03 6.14 < 0.03
2015 2015-01-13 0.03 6.14 < 0.03
2015 2015-01-13 0.03 6.14 < 0.03
2015 2015-01-13 0.03 6.14 < 0.03
2014 2014-10-14 0.03 6.14 < 0.03
2014 2014-10-14 0.03 6.14 < 0.03
2014 2014-08-18 0.03 6.14 < 0.03
2014 2014-07-22 0.03 6.14 < 0.03
2014 2014-07-22 0.03 6.14 < 0.03
2014 2014-07-22 0.03 6.14 < 0.03
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.03 0.0004 < 0.03
2015 2015-04-13 0.03 0.0004 < 0.03
2015 2015-01-13 0.03 0.0004 < 0.03
2015 2015-01-13 0.03 0.0004 < 0.03
2015 2015-01-13 0.03 0.0004 < 0.03
2015 2015-01-13 0.03 0.0004 < 0.03
2014 2014-10-14 0.03 0.0004 < 0.03
2014 2014-10-14 0.03 0.0004 < 0.03
2014 2014-08-18 0.03 0.0004 < 0.03
2014 2014-07-22 0.03 0.0004 < 0.03
2014 2014-07-22 0.03 0.0004 < 0.03
2014 2014-07-22 0.03 0.0004 < 0.03
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.1 0.0103 < 0.1
2015 2015-04-13 0.1 0.0103 < 0.1
2015 2015-01-13 0.1 0.0103 < 0.1
2015 2015-01-13 0.1 0.0103 < 0.1
2015 2015-01-13 0.1 0.0103 < 0.1
2015 2015-01-13 0.1 0.0103 < 0.1
2014 2014-10-14 0.1 0.0103 < 0.1
2014 2014-10-14 0.1 0.0103 < 0.1
2014 2014-08-18 0.1 0.0103 < 0.1
2014 2014-07-22 0.1 0.0103 < 0.1
2014 2014-07-22 0.1 0.0103 < 0.1
2014 2014-07-22 0.1 0.0103 < 0.1
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.07 0.35 < 0.07
2015 2015-04-13 0.07 0.35 < 0.07
2015 2015-01-13 0.07 0.35 < 0.07
2015 2015-01-13 0.07 0.35 < 0.07
2015 2015-01-13 0.07 0.35 < 0.07
2015 2015-01-13 0.07 0.35 < 0.07
2014 2014-10-14 0.07 0.35 < 0.07
2014 2014-10-14 0.07 0.35 < 0.07
2014 2014-07-22 0.07 0.35 < 0.07
2014 2014-07-22 0.07 0.35 < 0.07
2014 2014-07-22 0.07 0.35 < 0.07
2014 2014-07-22 0.07 0.35 < 0.07
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.2 140 < 0.2
2015 2015-04-13 0.2 140 < 0.2
2015 2015-01-13 0.2 140 < 0.2
2015 2015-01-13 0.2 140 < 0.2
2015 2015-01-13 0.2 140 < 0.2
2015 2015-01-13 0.2 140 < 0.2
2014 2014-10-14 0.2 140 < 0.2
2014 2014-10-14 0.2 140 < 0.2
2014 2014-08-18 0.2 140 < 0.2
2014 2014-07-22 0.2 140 < 0.2
2014 2014-07-22 0.2 140 < 0.2
2014 2014-07-22 0.2 140 < 0.2
chlorate 20 210 44.7143 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 20 210 44.341
2015 2015-04-13 20 210 < 20
2015 2015-04-13 20 210 69.805
2015 2015-01-13 20 210 < 20
2015 2015-01-13 20 210 < 20
2015 2015-01-13 20 210 28.197
2015 2015-01-13 20 210 < 20
2015 2015-01-13 20 210 63.029
2014 2014-10-14 20 210 84.244
2014 2014-10-14 20 210 56.918
2014 2014-10-14 20 210 116.931
2014 2014-07-22 20 210 < 20
2014 2014-07-22 20 210 < 20
2014 2014-07-22 20 210 87.817
2014 2014-07-22 20 210 42.336
2014 2014-07-22 20 210 121.81
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.2 2.69 < 0.2
2015 2015-04-13 0.2 2.69 < 0.2
2015 2015-01-13 0.2 2.69 < 0.2
2015 2015-01-13 0.2 2.69 < 0.2
2015 2015-01-13 0.2 2.69 < 0.2
2015 2015-01-13 0.2 2.69 < 0.2
2014 2014-10-14 0.2 2.69 < 0.2
2014 2014-10-14 0.2 2.69 < 0.2
2014 2014-08-18 0.2 2.69 < 0.2
2014 2014-07-22 0.2 2.69 < 0.2
2014 2014-07-22 0.2 2.69 < 0.2
2014 2014-07-22 0.2 2.69 < 0.2
chromium 0.2 100 0.0222 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.2 100 < 0.2
2015 2015-04-13 0.2 100 < 0.2
2015 2015-04-13 0.2 100 < 0.2
2015 2015-01-13 0.2 100 < 0.2
2015 2015-01-13 0.2 100 < 0.2
2015 2015-01-13 0.2 100 < 0.2
2015 2015-01-13 0.2 100 < 0.2
2015 2015-01-13 0.2 100 < 0.2
2014 2014-10-14 0.2 100 < 0.2
2014 2014-10-14 0.2 100 < 0.2
2014 2014-10-14 0.2 100 0.355
2014 2014-07-22 0.2 100 < 0.2
2014 2014-07-22 0.2 100 < 0.2
2014 2014-07-22 0.2 100 < 0.2
2014 2014-07-22 0.2 100 < 0.2
2014 2014-07-22 0.2 100 < 0.2
chromium-6 0.03 0 0.0399 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.03 0 < 0.03
2015 2015-04-13 0.03 0 0.098
2015 2015-04-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 0.109
2015 2015-01-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 0.061
2015 2015-01-13 0.03 0 0.03
2014 2014-10-14 0.03 0 < 0.03
2014 2014-10-14 0.03 0 0.064
2014 2014-10-14 0.03 0 0.056
2014 2014-07-22 0.03 0 < 0.03
2014 2014-07-22 0.03 0 0.119
2014 2014-07-22 0.03 0 0.039
2014 2014-07-22 0.03 0 0.062
2014 2014-07-22 0.03 0 < 0.03
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 1 70 < 1
2015 2015-04-13 1 70 < 1
2015 2015-04-13 1 70 < 1
2015 2015-01-13 1 70 < 1
2015 2015-01-13 1 70 < 1
2015 2015-01-13 1 70 < 1
2015 2015-01-13 1 70 < 1
2015 2015-01-13 1 70 < 1
2014 2014-10-14 1 70 < 1
2014 2014-10-14 1 70 < 1
2014 2014-10-14 1 70 < 1
2014 2014-07-22 1 70 < 1
2014 2014-07-22 1 70 < 1
2014 2014-07-22 1 70 < 1
2014 2014-07-22 1 70 < 1
2014 2014-07-22 1 70 < 1
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.06 90 < 0.06
2015 2015-04-13 0.06 90 < 0.06
2015 2015-01-13 0.06 90 < 0.06
2015 2015-01-13 0.06 90 < 0.06
2015 2015-01-13 0.06 90 < 0.06
2015 2015-01-13 0.06 90 < 0.06
2014 2014-10-14 0.06 90 < 0.06
2014 2014-10-14 0.06 90 < 0.06
2014 2014-08-18 0.06 90 < 0.06
2014 2014-07-22 0.06 90 < 0.06
2014 2014-07-22 0.06 90 < 0.06
2014 2014-07-22 0.06 90 < 0.06
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.08 0 < 0.08
2015 2015-04-13 0.08 0 < 0.08
2015 2015-01-13 0.08 0 < 0.08
2015 2015-01-13 0.08 0 < 0.08
2015 2015-01-13 0.08 0 < 0.08
2015 2015-01-13 0.08 0 < 0.08
2014 2014-10-14 0.08 0 < 0.08
2014 2014-10-14 0.08 0 < 0.08
2014 2014-08-18 0.08 0 < 0.08
2014 2014-07-22 0.08 0 < 0.08
2014 2014-07-22 0.08 0 < 0.08
2014 2014-07-22 0.08 0 < 0.08
molybdenum 1 40 0.2623 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 1 40 < 1
2015 2015-04-13 1 40 < 1
2015 2015-04-13 1 40 < 1
2015 2015-01-13 1 40 1.636
2015 2015-01-13 1 40 < 1
2015 2015-01-13 1 40 < 1
2015 2015-01-13 1 40 1.096
2015 2015-01-13 1 40 < 1
2014 2014-10-14 1 40 < 1
2014 2014-10-14 1 40 < 1
2014 2014-10-14 1 40 < 1
2014 2014-07-22 1 40 1.464
2014 2014-07-22 1 40 < 1
2014 2014-07-22 1 40 < 1
2014 2014-07-22 1 40 < 1
2014 2014-07-22 1 40 < 1
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.09 0 < 0.09
2015 2015-04-13 0.09 0 < 0.09
2015 2015-01-13 0.09 0 < 0.09
2015 2015-01-13 0.09 0 < 0.09
2015 2015-01-13 0.09 0 < 0.09
2015 2015-01-13 0.09 0 < 0.09
2014 2014-10-14 0.09 0 < 0.09
2014 2014-10-14 0.09 0 < 0.09
2014 2014-07-22 0.09 0 < 0.09
2014 2014-07-22 0.09 0 < 0.09
2014 2014-07-22 0.09 0 < 0.09
2014 2014-07-22 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.01 0 < 0.01
2015 2015-04-13 0.01 0 < 0.01
2015 2015-01-13 0.01 0 < 0.01
2015 2015-01-13 0.01 0 < 0.01
2015 2015-01-13 0.01 0 < 0.01
2015 2015-01-13 0.01 0 < 0.01
2014 2014-10-14 0.01 0 < 0.01
2014 2014-10-14 0.01 0 < 0.01
2014 2014-07-22 0.01 0 < 0.01
2014 2014-07-22 0.01 0 < 0.01
2014 2014-07-22 0.01 0 < 0.01
2014 2014-07-22 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.03 0 < 0.03
2015 2015-04-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 < 0.03
2015 2015-01-13 0.03 0 < 0.03
2014 2014-10-14 0.03 0 < 0.03
2014 2014-10-14 0.03 0 < 0.03
2014 2014-07-22 0.03 0 < 0.03
2014 2014-07-22 0.03 0 < 0.03
2014 2014-07-22 0.03 0 < 0.03
2014 2014-07-22 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.02 0 < 0.02
2015 2015-04-13 0.02 0 < 0.02
2015 2015-01-13 0.02 0 < 0.02
2015 2015-01-13 0.02 0 < 0.02
2015 2015-01-13 0.02 0 < 0.02
2015 2015-01-13 0.02 0 < 0.02
2014 2014-10-14 0.02 0 < 0.02
2014 2014-10-14 0.02 0 < 0.02
2014 2014-07-22 0.02 0 < 0.02
2014 2014-07-22 0.02 0 < 0.02
2014 2014-07-22 0.02 0 < 0.02
2014 2014-07-22 0.02 0 < 0.02
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.02 0.07 < 0.02
2015 2015-04-13 0.02 0.07 < 0.02
2015 2015-01-13 0.02 0.07 < 0.02
2015 2015-01-13 0.02 0.07 < 0.02
2015 2015-01-13 0.02 0.07 < 0.02
2015 2015-01-13 0.02 0.07 < 0.02
2014 2014-10-14 0.02 0.07 < 0.02
2014 2014-10-14 0.02 0.07 < 0.02
2014 2014-07-22 0.02 0.07 < 0.02
2014 2014-07-22 0.02 0.07 < 0.02
2014 2014-07-22 0.02 0.07 < 0.02
2014 2014-07-22 0.02 0.07 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.04 0.07 < 0.04
2015 2015-04-13 0.04 0.07 < 0.04
2015 2015-01-13 0.04 0.07 < 0.04
2015 2015-01-13 0.04 0.07 < 0.04
2015 2015-01-13 0.04 0.07 < 0.04
2015 2015-01-13 0.04 0.07 < 0.04
2014 2014-10-14 0.04 0.07 < 0.04
2014 2014-10-14 0.04 0.07 < 0.04
2014 2014-07-22 0.04 0.07 < 0.04
2014 2014-07-22 0.04 0.07 < 0.04
2014 2014-07-22 0.04 0.07 < 0.04
2014 2014-07-22 0.04 0.07 < 0.04
strontium 0.3 1500 150.3 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.3 1500 61.141
2015 2015-04-13 0.3 1500 213.901
2015 2015-04-13 0.3 1500 122.525
2015 2015-01-13 0.3 1500 263.788
2015 2015-01-13 0.3 1500 247.087
2015 2015-01-13 0.3 1500 65.2
2015 2015-01-13 0.3 1500 232.865
2015 2015-01-13 0.3 1500 82.147
2014 2014-11-17 0.3 1500 90.208
2014 2014-10-14 0.3 1500 51.868
2014 2014-10-14 0.3 1500 195.986
2014 2014-07-22 0.3 1500 247.293
2014 2014-07-22 0.3 1500 219.105
2014 2014-07-22 0.3 1500 49.127
2014 2014-07-22 0.3 1500 192.633
2014 2014-07-22 0.3 1500 69.926
vanadium 0.2 21 0.5091 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-04-13 0.2 21 < 0.2
2015 2015-04-13 0.2 21 0.667
2015 2015-04-13 0.2 21 0.299
2015 2015-01-13 0.2 21 1.576
2015 2015-01-13 0.2 21 0.759
2015 2015-01-13 0.2 21 < 0.2
2015 2015-01-13 0.2 21 0.639
2015 2015-01-13 0.2 21 < 0.2
2014 2014-10-14 0.2 21 < 0.2
2014 2014-10-14 0.2 21 0.769
2014 2014-10-14 0.2 21 0.338
2014 2014-07-22 0.2 21 1.428
2014 2014-07-22 0.2 21 0.641
2014 2014-07-22 0.2 21 0.302
2014 2014-07-22 0.2 21 0.728
2014 2014-07-22 0.2 21 < 0.2

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
NJ141699 lead 2015-01-01 2017-12-31 0.0034mg/L
NJ136953 lead 2012-01-01 2014-12-31 0.0071mg/L
NJ133653 lead 2009-01-01 2011-12-31 0.0092mg/L
NJ122684 lead 2006-01-01 2008-12-31 0.01mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2017-08-01 - 2017-08-31 Surface Water Treatment Rule Monitoring of Treatment (SWTR-Filter) Surface Water Treatment Rule Returned to Compliance
2015-07-01 - 2015-07-31 Surface Water Treatment Rule Monitoring of Treatment (SWTR-Filter) Surface Water Treatment Rule Returned to Compliance
2012-04-01 - 2012-05-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2012-04-01 - 2012-05-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2005-10-01 - 2005-12-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2005-10-01 - 2005-12-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2005-07-01 - 2005-09-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2005-07-01 - 2005-09-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2005-04-01 - 2005-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2005-04-01 - 2005-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2005-01-01 - 2005-03-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2005-01-01 - 2005-03-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2004-10-01 - 2004-12-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2004-10-01 - 2004-12-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2004-04-01 - 2004-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2004-04-01 - 2004-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2004-01-01 - 2004-03-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2004-01-01 - 2004-03-31 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) Returned to Compliance
2004-02-01 - 2004-02-29 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Returned to Compliance
2015-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance
2014-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule Returned to Compliance
- N/A Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Returned to Compliance
- N/A Radionuclides Monitoring, Regular Gross Alpha, Excl. Radon and U Known
- N/A Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Returned to Compliance

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
Chemtech Mountainside, NJ 07092
IRIS Environmental Laboratories, LLC Union, NJ 7083
CHEMTECH Mountainside, NJ 07092

Water Bill Information


Convenient information about your water service.

Unable to identify any billing information about Montville Twp Mua (NJ1421003).

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.