Issaquah Water System 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: WA5336350
Type: Community water system
EPA Region: 10
Primary Service Area: Residential Area
Primary Source: Ground water
Population Served: 36,696 		Contact Information
ISSAQUAH WATER SYSTEM
BRET HEATH
PO BOX 1307
ISSAQUAH, WA 98027-1307

This public water system services 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   (1) 2014   (1) 2015   (0) 2016   (0) 2017   (0) 2018   (0)
PFOS PFOS

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).

PFOS

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2014 2014-01-08 0.04 0.07 0.514
2014 2014-01-08 0.04 0.07 < 0.04
2014 2014-01-08 0.04 0.07 < 0.04
2014 2014-01-08 0.04 0.07 < 0.04
2013 2013-07-22 0.04 0.07 0.6
2013 2013-07-22 0.04 0.07 < 0.04
2013 2013-07-22 0.04 0.07 < 0.04
2013 2013-07-22 0.04 0.07 < 0.04

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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
chlorate 20 210 18 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2013 2013-07-22 20 210 35
2013 2013-07-22 20 210 35
2013 2013-07-22 20 210 28
2013 2013-07-22 20 210 49
2013 2013-07-22 20 210 40
2013 2013-07-22 20 210 36
2013 2013-07-22 20 210 22
2013 2013-07-22 20 210 25
[+] Expand Test Data
chromium 0.2 100 0.1388 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.2 100 0.2
2014 2014-01-08 0.2 100 < 0.2
2014 2014-01-08 0.2 100 0.24
2014 2014-01-08 0.2 100 < 0.2
2014 2014-01-08 0.2 100 < 0.2
2014 2014-01-08 0.2 100 < 0.2
2014 2014-01-08 0.2 100 0.3
2014 2014-01-08 0.2 100 0.3
2013 2013-07-22 0.2 100 0.25
2013 2013-07-22 0.2 100 < 0.2
2013 2013-07-22 0.2 100 0.23
2013 2013-07-22 0.2 100 < 0.2
2013 2013-07-22 0.2 100 0.23
2013 2013-07-22 0.2 100 < 0.2
2013 2013-07-22 0.2 100 0.24
2013 2013-07-22 0.2 100 0.23
[+] Expand Test Data
chromium-6 0.03 0 0.0825 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.03 0 0.117
2014 2014-01-08 0.03 0 0.048
2014 2014-01-08 0.03 0 0.114
2014 2014-01-08 0.03 0 0.061
2014 2014-01-08 0.03 0 < 0.03
2014 2014-01-08 0.03 0 < 0.03
2014 2014-01-08 0.03 0 0.164
2014 2014-01-08 0.03 0 0.158
2013 2013-07-22 0.03 0 0.157
2013 2013-07-22 0.03 0 0.039
2013 2013-07-22 0.03 0 0.135
2013 2013-07-22 0.03 0 0.051
2013 2013-07-22 0.03 0 < 0.03
2013 2013-07-22 0.03 0 < 0.03
2013 2013-07-22 0.03 0 0.139
2013 2013-07-22 0.03 0 0.137
[+] Expand Test Data
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
2013 2013-07-22 1 70 < 1
[+] Expand Test Data
molybdenum 1 40 0.1281 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 1
2014 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 1.05
2013 2013-07-22 1 40 < 1
2013 2013-07-22 1 40 < 1
[+] Expand Test Data
strontium 0.3 1500 87.7875 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.3 1500 69
2014 2014-01-08 0.3 1500 86
2014 2014-01-08 0.3 1500 68
2014 2014-01-08 0.3 1500 80
2014 2014-01-08 0.3 1500 81
2014 2014-01-08 0.3 1500 104
2014 2014-01-08 0.3 1500 55
2014 2014-01-08 0.3 1500 56
2013 2013-07-22 0.3 1500 87.7
2013 2013-07-22 0.3 1500 122
2013 2013-07-22 0.3 1500 91.3
2013 2013-07-22 0.3 1500 114
2013 2013-07-22 0.3 1500 109
2013 2013-07-22 0.3 1500 137
2013 2013-07-22 0.3 1500 75.3
2013 2013-07-22 0.3 1500 69.3
[+] Expand Test Data
vanadium 0.2 21 0.3175 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.2 21 0.33
2014 2014-01-08 0.2 21 0.4
2014 2014-01-08 0.2 21 0.37
2014 2014-01-08 0.2 21 0.38
2014 2014-01-08 0.2 21 0.3
2014 2014-01-08 0.2 21 < 0.2
2014 2014-01-08 0.2 21 0.25
2014 2014-01-08 0.2 21 0.27
2013 2013-07-22 0.2 21 0.35
2013 2013-07-22 0.2 21 0.62
2013 2013-07-22 0.2 21 0.41
2013 2013-07-22 0.2 21 0.52
2013 2013-07-22 0.2 21 0.35
2013 2013-07-22 0.2 21 < 0.2
2013 2013-07-22 0.2 21 0.26
2013 2013-07-22 0.2 21 0.27
[+] Expand Test Data
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-03-11 0.03 6.14 < 0.03
2015 2015-03-11 0.03 6.14 < 0.03
2015 2015-03-11 0.03 6.14 < 0.03
2015 2015-03-11 0.03 6.14 < 0.03
2013 2013-07-22 0.03 6.14 < 0.03
2013 2013-07-22 0.03 6.14 < 0.03
2013 2013-07-22 0.03 6.14 < 0.03
2013 2013-07-22 0.03 6.14 < 0.03
[+] Expand Test Data
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-03-11 0.03 0.0004 < 0.03
2015 2015-03-11 0.03 0.0004 < 0.03
2015 2015-03-11 0.03 0.0004 < 0.03
2015 2015-03-11 0.03 0.0004 < 0.03
2013 2013-07-22 0.03 0.0004 < 0.03
2013 2013-07-22 0.03 0.0004 < 0.03
2013 2013-07-22 0.03 0.0004 < 0.03
2013 2013-07-22 0.03 0.0004 < 0.03
[+] Expand Test Data
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-03-11 0.1 0.0103 < 0.1
2015 2015-03-11 0.1 0.0103 < 0.1
2015 2015-03-11 0.1 0.0103 < 0.1
2015 2015-03-11 0.1 0.0103 < 0.1
2013 2013-07-22 0.1 0.0103 < 0.1
2013 2013-07-22 0.1 0.0103 < 0.1
2013 2013-07-22 0.1 0.0103 < 0.1
2013 2013-07-22 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
2014 2014-01-08 0.07 0.35 < 0.07
2014 2014-01-08 0.07 0.35 < 0.07
2014 2014-01-08 0.07 0.35 < 0.07
2014 2014-01-08 0.07 0.35 < 0.07
2013 2013-07-22 0.07 0.35 < 0.07
2013 2013-07-22 0.07 0.35 < 0.07
2013 2013-07-22 0.07 0.35 < 0.07
2013 2013-07-22 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
2015 2015-03-11 0.2 140 < 0.2
2015 2015-03-11 0.2 140 < 0.2
2015 2015-03-11 0.2 140 < 0.2
2015 2015-03-11 0.2 140 < 0.2
2013 2013-07-22 0.2 140 < 0.2
2013 2013-07-22 0.2 140 < 0.2
2013 2013-07-22 0.2 140 < 0.2
2013 2013-07-22 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
2015 2015-03-11 0.2 2.69 < 0.2
2015 2015-03-11 0.2 2.69 < 0.2
2015 2015-03-11 0.2 2.69 < 0.2
2015 2015-03-11 0.2 2.69 < 0.2
2013 2013-07-22 0.2 2.69 < 0.2
2013 2013-07-22 0.2 2.69 < 0.2
2013 2013-07-22 0.2 2.69 < 0.2
2013 2013-07-22 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
2015 2015-03-11 0.06 90 < 0.06
2015 2015-03-11 0.06 90 < 0.06
2015 2015-03-11 0.06 90 < 0.06
2015 2015-03-11 0.06 90 < 0.06
2013 2013-07-22 0.06 90 < 0.06
2013 2013-07-22 0.06 90 < 0.06
2013 2013-07-22 0.06 90 < 0.06
2013 2013-07-22 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
2015 2015-03-11 0.08 0 < 0.08
2015 2015-03-11 0.08 0 < 0.08
2015 2015-03-11 0.08 0 < 0.08
2015 2015-03-11 0.08 0 < 0.08
2013 2013-07-22 0.08 0 < 0.08
2013 2013-07-22 0.08 0 < 0.08
2013 2013-07-22 0.08 0 < 0.08
2013 2013-07-22 0.08 0 < 0.08
[+] Expand Test Data
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.09 0 < 0.09
2014 2014-01-08 0.09 0 < 0.09
2014 2014-01-08 0.09 0 < 0.09
2014 2014-01-08 0.09 0 < 0.09
2013 2013-07-22 0.09 0 < 0.09
2013 2013-07-22 0.09 0 < 0.09
2013 2013-07-22 0.09 0 < 0.09
2013 2013-07-22 0.09 0 < 0.09
[+] Expand Test Data
PFHpA 0.01 0 0.0062 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.01 0 0.0234
2014 2014-01-08 0.01 0 < 0.01
2014 2014-01-08 0.01 0 < 0.01
2014 2014-01-08 0.01 0 < 0.01
2013 2013-07-22 0.01 0 0.0258
2013 2013-07-22 0.01 0 < 0.01
2013 2013-07-22 0.01 0 < 0.01
2013 2013-07-22 0.01 0 < 0.01
[+] Expand Test Data
PFHxS 0.03 0 0.0553 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.03 0 0.201
2014 2014-01-08 0.03 0 < 0.03
2014 2014-01-08 0.03 0 < 0.03
2014 2014-01-08 0.03 0 < 0.03
2013 2013-07-22 0.03 0 0.241
2013 2013-07-22 0.03 0 < 0.03
2013 2013-07-22 0.03 0 < 0.03
2013 2013-07-22 0.03 0 < 0.03
[+] Expand Test Data
PFNA 0.02 0 0.0068 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.02 0 0.0266
2014 2014-01-08 0.02 0 < 0.02
2014 2014-01-08 0.02 0 < 0.02
2014 2014-01-08 0.02 0 < 0.02
2013 2013-07-22 0.02 0 0.028
2013 2013-07-22 0.02 0 < 0.02
2013 2013-07-22 0.02 0 < 0.02
2013 2013-07-22 0.02 0 < 0.02
[+] Expand Test Data
PFOA 0.02 0.07 0.0052 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-08 0.02 0.07 0.02
2014 2014-01-08 0.02 0.07 < 0.02
2014 2014-01-08 0.02 0.07 < 0.02
2014 2014-01-08 0.02 0.07 < 0.02
2013 2013-07-22 0.02 0.07 0.0215
2013 2013-07-22 0.02 0.07 < 0.02
2013 2013-07-22 0.02 0.07 < 0.02
2013 2013-07-22 0.02 0.07 < 0.02
[+] 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
3676409 lead 2016-01-01 2018-12-31 0.001mg/L
3191281 lead 2013-01-01 2015-12-31 0.001mg/L
7655097 lead 2013-01-01 2015-12-31 0.001mg/L
2697248 lead 2010-01-01 2012-12-31 0.001mg/L
5811665 lead 2010-01-01 2012-12-31 0.001mg/L
4600486 lead 2007-01-01 2009-12-31 0.006mg/L

Violations

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

Compliance Dates Rule Violation Type Contaminant Name Status
2005-01-01 - 2007-12-31 Synthetic Organic Chemicals Monitoring, Regular Carbofuran Returned to Compliance
2005-01-01 - 2007-12-31 Synthetic Organic Chemicals Monitoring, Regular OXAMYL Returned to Compliance
2005-01-01 - 2007-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb Returned to Compliance
2005-01-01 - 2007-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb sulfoxide Returned to Compliance
2005-01-01 - 2007-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb sulfone Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular LASSO Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Di(2-ethylhexyl) adipate Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Di(2-ethylhexyl) phthalate Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular DICHLOROMETHANE Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Dinoseb Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Endrin Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Ethylbenzene Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular trans-1,2-Dichloroethylene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Heptachlor Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Heptachlor epoxide Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular HEXACHLOROBENZENE Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Hexachlorocyclopentadiene Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular CHLOROBENZENE Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Methoxychlor Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular o-Dichlorobenzene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular OXAMYL Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular p-Dichlorobenzene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Pentachlorophenol Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Picloram Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Simazine Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Styrene Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Tetrachloroethylene Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Toluene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Toxaphene Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Vinyl chloride Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Trichloroethylene Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1-Dichloroethylene Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1,1-Trichloroethane Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,1,2-Trichloroethane Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2-Dichloroethane Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2-Dichloropropane Returned to Compliance
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular 1,2,4-Trichlorobenzene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular 2,4,5-TP Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Dalapon Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb sulfone Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Aldicarb sulfoxide Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Atrazine Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Benzene Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Benzo(a)pyrene Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular BHC-GAMMA Known
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Carbofuran Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular Carbon tetrachloride Returned to Compliance
2002-01-01 - 2004-12-31 Synthetic Organic Chemicals Monitoring, Regular Chlordane Known
2002-01-01 - 2004-12-31 Volatile Organic Chemicals Monitoring, Regular cis-1,2-Dichloroethylene Returned to Compliance
2003-11-01 - 2003-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2000-12-01 - 2000-12-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2000-11-01 - 2000-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2000-07-01 - 2000-07-31 Total Coliform Rule Monitoring, Repeat Major (TCR) Coliform (TCR) Known
- N/A Radionuclides Monitoring, Regular Gross Alpha, Excl. Radon and U Known
- N/A Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
- N/A Lead and Copper Rule Follow-up Or Routine LCR Tap M/R Lead and Copper Rule Returned to Compliance
2015-07-01 - N/A Consumer Confidence Rule Consumer Confidence Report Complete Failure to Report Consumer Confidence Rule 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
Brooks Applied Labs, LLC Bothell, WA 98011
Lab/Cor, Inc. Seattle, WA 98117
LABCOR INC SEATTLE, WA 98117

Water Bill Information

Convenient information about your water service.

Unable to identify any billing information about Issaquah Water System (WA5336350).

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.