Cal-water Service Co.-marysville 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: CA5810001
Type : Community water system
EPA Region : 09
Primary Service Area: Residential Area
Primary Source: Ground water
Population Served: 12,244
Contact Information
JAMES, SOPHIE JAMES, SOPHIE 1720 NORTH FIRST STREET SAN JOSE, CA 95112-4508 [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):
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).
Below health limit
Exceeded health limit
Year
Test Date
MRLMinimum Reporting Level
HRLHealth Risk Limit
Test Result
2014
2014-10-20
20
210
140
2014
2014-10-01
20
210
740
2014
2014-10-01
20
210
380
2014
2014-10-01
20
210
240
2014
2014-04-08
20
210
190
2014
2014-04-08
20
210
250
2014
2014-04-08
20
210
160
2014
2014-02-25
20
210
21
2014
2014-02-25
20
210
< 20
2014
2014-02-12
20
210
100
2014
2014-02-11
20
210
79
2014
2014-02-11
20
210
130
2014
2014-02-11
20
210
73
2014
2014-02-11
20
210
84
2013
2013-08-14
20
210
230
2013
2013-08-12
20
210
120
2013
2013-08-06
20
210
160
2013
2013-08-06
20
210
190
2013
2013-08-06
20
210
330
2013
2013-08-06
20
210
260
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
2014
2014-10-20
0.03
6.14
< 0.03
2014
2014-10-01
0.03
6.14
< 0.03
2014
2014-10-01
0.03
6.14
< 0.03
2014
2014-04-08
0.03
6.14
< 0.03
2014
2014-04-08
0.03
6.14
< 0.03
2014
2014-02-25
0.03
6.14
< 0.03
2014
2014-02-25
0.03
6.14
< 0.03
2014
2014-02-12
0.03
6.14
< 0.03
2014
2014-02-11
0.03
6.14
< 0.03
2014
2014-02-11
0.03
6.14
< 0.03
2014
2014-02-11
0.03
6.14
< 0.03
2013
2013-08-14
0.03
6.14
< 0.03
2013
2013-08-12
0.03
6.14
< 0.03
2013
2013-08-06
0.03
6.14
< 0.03
2013
2013-08-06
0.03
6.14
< 0.03
2013
2013-08-06
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
2014
2014-10-20
0.03
0.0004
< 0.03
2014
2014-10-01
0.03
0.0004
< 0.03
2014
2014-10-01
0.03
0.0004
< 0.03
2014
2014-04-08
0.03
0.0004
< 0.03
2014
2014-04-08
0.03
0.0004
< 0.03
2014
2014-02-25
0.03
0.0004
< 0.03
2014
2014-02-25
0.03
0.0004
< 0.03
2014
2014-02-12
0.03
0.0004
< 0.03
2014
2014-02-11
0.03
0.0004
< 0.03
2014
2014-02-11
0.03
0.0004
< 0.03
2014
2014-02-11
0.03
0.0004
< 0.03
2013
2013-08-14
0.03
0.0004
< 0.03
2013
2013-08-12
0.03
0.0004
< 0.03
2013
2013-08-06
0.03
0.0004
< 0.03
2013
2013-08-06
0.03
0.0004
< 0.03
2013
2013-08-06
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
2014
2014-10-20
0.1
0.0103
< 0.1
2014
2014-10-01
0.1
0.0103
< 0.1
2014
2014-10-01
0.1
0.0103
< 0.1
2014
2014-04-08
0.1
0.0103
< 0.1
2014
2014-04-08
0.1
0.0103
< 0.1
2014
2014-02-25
0.1
0.0103
< 0.1
2014
2014-02-25
0.1
0.0103
< 0.1
2014
2014-02-12
0.1
0.0103
< 0.1
2014
2014-02-11
0.1
0.0103
< 0.1
2014
2014-02-11
0.1
0.0103
< 0.1
2014
2014-02-11
0.1
0.0103
< 0.1
2013
2013-08-14
0.1
0.0103
< 0.1
2013
2013-08-12
0.1
0.0103
< 0.1
2013
2013-08-06
0.1
0.0103
< 0.1
2013
2013-08-06
0.1
0.0103
< 0.1
2013
2013-08-06
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
2014-10-20
0.07
0.35
< 0.07
2014
2014-10-01
0.07
0.35
< 0.07
2014
2014-10-01
0.07
0.35
< 0.07
2014
2014-04-08
0.07
0.35
< 0.07
2014
2014-04-08
0.07
0.35
< 0.07
2014
2014-02-25
0.07
0.35
< 0.07
2014
2014-02-25
0.07
0.35
< 0.07
2014
2014-02-12
0.07
0.35
< 0.07
2014
2014-02-11
0.07
0.35
< 0.07
2014
2014-02-11
0.07
0.35
< 0.07
2014
2014-02-11
0.07
0.35
< 0.07
2013
2013-08-14
0.07
0.35
< 0.07
2013
2013-08-12
0.07
0.35
< 0.07
2013
2013-08-06
0.07
0.35
< 0.07
2013
2013-08-06
0.07
0.35
< 0.07
2013
2013-08-06
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
2014
2014-10-20
0.2
140
< 0.2
2014
2014-10-01
0.2
140
< 0.2
2014
2014-10-01
0.2
140
< 0.2
2014
2014-04-08
0.2
140
< 0.2
2014
2014-04-08
0.2
140
< 0.2
2014
2014-02-25
0.2
140
< 0.2
2014
2014-02-25
0.2
140
< 0.2
2014
2014-02-12
0.2
140
< 0.2
2014
2014-02-11
0.2
140
< 0.2
2014
2014-02-11
0.2
140
< 0.2
2014
2014-02-11
0.2
140
< 0.2
2013
2013-08-14
0.2
140
< 0.2
2013
2013-08-12
0.2
140
< 0.2
2013
2013-08-06
0.2
140
< 0.2
2013
2013-08-06
0.2
140
< 0.2
2013
2013-08-06
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
2014
2014-10-20
0.2
2.69
< 0.2
2014
2014-10-01
0.2
2.69
< 0.2
2014
2014-10-01
0.2
2.69
< 0.2
2014
2014-04-08
0.2
2.69
< 0.2
2014
2014-04-08
0.2
2.69
< 0.2
2014
2014-02-25
0.2
2.69
< 0.2
2014
2014-02-25
0.2
2.69
< 0.2
2014
2014-02-12
0.2
2.69
< 0.2
2014
2014-02-11
0.2
2.69
< 0.2
2014
2014-02-11
0.2
2.69
< 0.2
2014
2014-02-11
0.2
2.69
< 0.2
2013
2013-08-14
0.2
2.69
< 0.2
2013
2013-08-12
0.2
2.69
< 0.2
2013
2013-08-06
0.2
2.69
< 0.2
2013
2013-08-06
0.2
2.69
< 0.2
2013
2013-08-06
0.2
2.69
< 0.2
[+] Expand Test Data
chromium
0.2
100
1.1075
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-28
0.2
100
1.1
2014
2014-10-20
0.2
100
1.6
2014
2014-10-01
0.2
100
1.1
2014
2014-10-01
0.2
100
1.1
2014
2014-04-08
0.2
100
0.85
2014
2014-04-08
0.2
100
0.86
2014
2014-04-08
0.2
100
0.67
2014
2014-02-25
0.2
100
0.83
2014
2014-02-25
0.2
100
< 0.2
2014
2014-02-12
0.2
100
2.9
2014
2014-02-11
0.2
100
0.81
2014
2014-02-11
0.2
100
1.1
2014
2014-02-11
0.2
100
1.5
2014
2014-02-11
0.2
100
0.95
2013
2013-08-14
0.2
100
< 0.2
2013
2013-08-12
0.2
100
2.2
2013
2013-08-06
0.2
100
0.91
2013
2013-08-06
0.2
100
0.97
2013
2013-08-06
0.2
100
1.4
2013
2013-08-06
0.2
100
1.3
[+] Expand Test Data
chromium-6
0.03
0
1.287
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.03
0
1.6
2014
2014-10-01
0.03
0
1.1
2014
2014-10-01
0.03
0
1.1
2014
2014-10-01
0.03
0
1.2
2014
2014-04-08
0.03
0
1.1
2014
2014-04-08
0.03
0
1
2014
2014-04-08
0.03
0
0.84
2014
2014-02-25
0.03
0
0.94
2014
2014-02-25
0.03
0
< 0.03
2014
2014-02-12
0.03
0
3.3
2014
2014-02-11
0.03
0
0.96
2014
2014-02-11
0.03
0
1.4
2014
2014-02-11
0.03
0
1.8
2014
2014-02-11
0.03
0
1.2
2013
2013-08-14
0.03
0
< 0.03
2013
2013-08-12
0.03
0
2.6
2013
2013-08-06
0.03
0
1.2
2013
2013-08-06
0.03
0
1.2
2013
2013-08-06
0.03
0
1.7
2013
2013-08-06
0.03
0
1.5
[+] Expand Test Data
cobalt
1
70
< 1
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-28
1
70
< 1
2014
2014-10-20
1
70
< 1
2014
2014-10-01
1
70
< 1
2014
2014-10-01
1
70
< 1
2014
2014-04-08
1
70
< 1
2014
2014-04-08
1
70
< 1
2014
2014-04-08
1
70
< 1
2014
2014-02-25
1
70
< 1
2014
2014-02-25
1
70
< 1
2014
2014-02-12
1
70
< 1
2014
2014-02-11
1
70
< 1
2014
2014-02-11
1
70
< 1
2014
2014-02-11
1
70
< 1
2014
2014-02-11
1
70
< 1
2013
2013-08-14
1
70
< 1
2013
2013-08-12
1
70
< 1
2013
2013-08-06
1
70
< 1
2013
2013-08-06
1
70
< 1
2013
2013-08-06
1
70
< 1
2013
2013-08-06
1
70
< 1
[+] Expand Test Data
Halon 1011
0.06
90
< 0.06
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.06
90
< 0.06
2014
2014-10-01
0.06
90
< 0.06
2014
2014-10-01
0.06
90
< 0.06
2014
2014-04-08
0.06
90
< 0.06
2014
2014-04-08
0.06
90
< 0.06
2014
2014-02-25
0.06
90
< 0.06
2014
2014-02-25
0.06
90
< 0.06
2014
2014-02-12
0.06
90
< 0.06
2014
2014-02-11
0.06
90
< 0.06
2014
2014-02-11
0.06
90
< 0.06
2014
2014-02-11
0.06
90
< 0.06
2013
2013-08-14
0.06
90
< 0.06
2013
2013-08-12
0.06
90
< 0.06
2013
2013-08-06
0.06
90
< 0.06
2013
2013-08-06
0.06
90
< 0.06
2013
2013-08-06
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
2014
2014-10-20
0.08
0
< 0.08
2014
2014-10-01
0.08
0
< 0.08
2014
2014-10-01
0.08
0
< 0.08
2014
2014-04-08
0.08
0
< 0.08
2014
2014-04-08
0.08
0
< 0.08
2014
2014-02-25
0.08
0
< 0.08
2014
2014-02-25
0.08
0
< 0.08
2014
2014-02-12
0.08
0
< 0.08
2014
2014-02-11
0.08
0
< 0.08
2014
2014-02-11
0.08
0
< 0.08
2014
2014-02-11
0.08
0
< 0.08
2013
2013-08-14
0.08
0
< 0.08
2013
2013-08-12
0.08
0
< 0.08
2013
2013-08-06
0.08
0
< 0.08
2013
2013-08-06
0.08
0
< 0.08
2013
2013-08-06
0.08
0
< 0.08
[+] Expand Test Data
molybdenum
1
40
< 1
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-28
1
40
< 1
2014
2014-10-20
1
40
< 1
2014
2014-10-01
1
40
< 1
2014
2014-10-01
1
40
< 1
2014
2014-04-08
1
40
< 1
2014
2014-04-08
1
40
< 1
2014
2014-04-08
1
40
< 1
2014
2014-02-25
1
40
< 1
2014
2014-02-25
1
40
< 1
2014
2014-02-12
1
40
< 1
2014
2014-02-11
1
40
< 1
2014
2014-02-11
1
40
< 1
2014
2014-02-11
1
40
< 1
2014
2014-02-11
1
40
< 1
2013
2013-08-14
1
40
< 1
2013
2013-08-12
1
40
< 1
2013
2013-08-06
1
40
< 1
2013
2013-08-06
1
40
< 1
2013
2013-08-06
1
40
< 1
2013
2013-08-06
1
40
< 1
[+] Expand Test Data
PFBS
0.09
0
< 0.09
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.09
0
< 0.09
2014
2014-10-01
0.09
0
< 0.09
2014
2014-10-01
0.09
0
< 0.09
2014
2014-04-08
0.09
0
< 0.09
2014
2014-04-08
0.09
0
< 0.09
2014
2014-02-25
0.09
0
< 0.09
2014
2014-02-25
0.09
0
< 0.09
2014
2014-02-12
0.09
0
< 0.09
2014
2014-02-11
0.09
0
< 0.09
2014
2014-02-11
0.09
0
< 0.09
2014
2014-02-11
0.09
0
< 0.09
2013
2013-08-14
0.09
0
< 0.09
2013
2013-08-12
0.09
0
< 0.09
2013
2013-08-06
0.09
0
< 0.09
2013
2013-08-06
0.09
0
< 0.09
2013
2013-08-06
0.09
0
< 0.09
[+] Expand Test Data
PFHpA
0.01
0
< 0.01
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.01
0
< 0.01
2014
2014-10-01
0.01
0
< 0.01
2014
2014-10-01
0.01
0
< 0.01
2014
2014-04-08
0.01
0
< 0.01
2014
2014-04-08
0.01
0
< 0.01
2014
2014-02-25
0.01
0
< 0.01
2014
2014-02-25
0.01
0
< 0.01
2014
2014-02-12
0.01
0
< 0.01
2014
2014-02-11
0.01
0
< 0.01
2014
2014-02-11
0.01
0
< 0.01
2014
2014-02-11
0.01
0
< 0.01
2013
2013-08-14
0.01
0
< 0.01
2013
2013-08-12
0.01
0
< 0.01
2013
2013-08-06
0.01
0
< 0.01
2013
2013-08-06
0.01
0
< 0.01
2013
2013-08-06
0.01
0
< 0.01
[+] Expand Test Data
PFHxS
0.03
0
< 0.03
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.03
0
< 0.03
2014
2014-10-01
0.03
0
< 0.03
2014
2014-10-01
0.03
0
< 0.03
2014
2014-04-08
0.03
0
< 0.03
2014
2014-04-08
0.03
0
< 0.03
2014
2014-02-25
0.03
0
< 0.03
2014
2014-02-25
0.03
0
< 0.03
2014
2014-02-12
0.03
0
< 0.03
2014
2014-02-11
0.03
0
< 0.03
2014
2014-02-11
0.03
0
< 0.03
2014
2014-02-11
0.03
0
< 0.03
2013
2013-08-14
0.03
0
< 0.03
2013
2013-08-12
0.03
0
< 0.03
2013
2013-08-06
0.03
0
< 0.03
2013
2013-08-06
0.03
0
< 0.03
2013
2013-08-06
0.03
0
< 0.03
[+] Expand Test Data
PFNA
0.02
0
< 0.02
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-20
0.02
0
< 0.02
2014
2014-10-01
0.02
0
< 0.02
2014
2014-10-01
0.02
0
< 0.02
2014
2014-04-08
0.02
0
< 0.02
2014
2014-04-08
0.02
0
< 0.02
2014
2014-02-25
0.02
0
< 0.02
2014
2014-02-25
0.02
0
< 0.02
2014
2014-02-12
0.02
0
< 0.02
2014
2014-02-11
0.02
0
< 0.02
2014
2014-02-11
0.02
0
< 0.02
2014
2014-02-11
0.02
0
< 0.02
2013
2013-08-14
0.02
0
< 0.02
2013
2013-08-12
0.02
0
< 0.02
2013
2013-08-06
0.02
0
< 0.02
2013
2013-08-06
0.02
0
< 0.02
2013
2013-08-06
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
2014
2014-10-20
0.02
0.07
< 0.02
2014
2014-10-01
0.02
0.07
< 0.02
2014
2014-10-01
0.02
0.07
< 0.02
2014
2014-04-08
0.02
0.07
< 0.02
2014
2014-04-08
0.02
0.07
< 0.02
2014
2014-02-25
0.02
0.07
< 0.02
2014
2014-02-25
0.02
0.07
< 0.02
2014
2014-02-12
0.02
0.07
< 0.02
2014
2014-02-11
0.02
0.07
< 0.02
2014
2014-02-11
0.02
0.07
< 0.02
2014
2014-02-11
0.02
0.07
< 0.02
2013
2013-08-14
0.02
0.07
< 0.02
2013
2013-08-12
0.02
0.07
< 0.02
2013
2013-08-06
0.02
0.07
< 0.02
2013
2013-08-06
0.02
0.07
< 0.02
2013
2013-08-06
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
2014
2014-10-20
0.04
0.07
< 0.04
2014
2014-10-01
0.04
0.07
< 0.04
2014
2014-10-01
0.04
0.07
< 0.04
2014
2014-04-08
0.04
0.07
< 0.04
2014
2014-04-08
0.04
0.07
< 0.04
2014
2014-02-25
0.04
0.07
< 0.04
2014
2014-02-25
0.04
0.07
< 0.04
2014
2014-02-12
0.04
0.07
< 0.04
2014
2014-02-11
0.04
0.07
< 0.04
2014
2014-02-11
0.04
0.07
< 0.04
2014
2014-02-11
0.04
0.07
< 0.04
2013
2013-08-14
0.04
0.07
< 0.04
2013
2013-08-12
0.04
0.07
< 0.04
2013
2013-08-06
0.04
0.07
< 0.04
2013
2013-08-06
0.04
0.07
< 0.04
2013
2013-08-06
0.04
0.07
< 0.04
[+] Expand Test Data
strontium
0.3
1500
277
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-28
0.3
1500
240
2014
2014-10-20
0.3
1500
340
2014
2014-10-01
0.3
1500
310
2014
2014-10-01
0.3
1500
280
2014
2014-04-08
0.3
1500
220
2014
2014-04-08
0.3
1500
210
2014
2014-04-08
0.3
1500
320
2014
2014-02-25
0.3
1500
280
2014
2014-02-25
0.3
1500
310
2014
2014-02-12
0.3
1500
200
2014
2014-02-11
0.3
1500
380
2014
2014-02-11
0.3
1500
190
2014
2014-02-11
0.3
1500
270
2014
2014-02-11
0.3
1500
380
2013
2013-08-14
0.3
1500
330
2013
2013-08-12
0.3
1500
220
2013
2013-08-06
0.3
1500
260
2013
2013-08-06
0.3
1500
210
2013
2013-08-06
0.3
1500
300
2013
2013-08-06
0.3
1500
290
[+] Expand Test Data
vanadium
0.2
21
7.0445
[+] Expand Test Data
Year
Test Date
MRL
HRL
Test Result
2014
2014-10-28
0.2
21
11
2014
2014-10-20
0.2
21
6.5
2014
2014-10-01
0.2
21
11
2014
2014-10-01
0.2
21
7.1
2014
2014-04-08
0.2
21
9.7
2014
2014-04-08
0.2
21
9.6
2014
2014-04-08
0.2
21
5.6
2014
2014-02-25
0.2
21
8.9
2014
2014-02-25
0.2
21
0.99
2014
2014-02-12
0.2
21
7.9
2014
2014-02-11
0.2
21
5.6
2014
2014-02-11
0.2
21
7.9
2014
2014-02-11
0.2
21
7
2014
2014-02-11
0.2
21
5
2013
2013-08-14
0.2
21
1.3
2013
2013-08-12
0.2
21
7.8
2013
2013-08-06
0.2
21
6.5
2013
2013-08-06
0.2
21
7.4
2013
2013-08-06
0.2
21
7
2013
2013-08-06
0.2
21
7.1
[+] 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
CA65278
lead
2017-01-01
2019-12-31
0mg/L
CA53938
lead
2014-01-01
2016-12-31
0mg/L
CA40552
lead
2011-01-01
2013-12-31
0mg/L
Violations
Known violations of the Safe Drinking Water Act as recorded by the EPA.
Compliance Dates
Rule
Violation Type
Contaminant Name
Status
- N/A
Total Coliform Rule
Maximum Contaminant Level Violation, Monthly (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.
Water Bill Information
Convenient information about your water service.
Unable to identify any billing information about Cal-water Service Co.-marysville (CA5810001).
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.