Marin Municipal Water District 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: CA2110002
Type: Community water system
EPA Region: 09
Primary Service Area: Wholesaler of Water
Primary Source: Surface water
Population Served: 189,400
Contact Information
SELLIER, PAUL
SELLIER, PAUL
220 Nellen Avenue
CORTE MADERA, CA 94925
[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).

HAA5

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-08-13 0 0.00 20.562
2018 2018-08-13 0 0.00 20.793
2018 2018-08-13 0 0.00 19.292
2018 2018-08-13 0 0.00 18.038
2018 2018-08-13 0 0.00 7.48
2018 2018-08-13 0 0.00 18.481
2018 2018-08-13 0 0.00 7.602
2018 2018-08-13 0 0.00 18.924
2018 2018-05-14 0 0.00 18.262
2018 2018-05-14 0 0.00 19.27
2018 2018-05-14 0 0.00 7.767
2018 2018-05-14 0 0.00 16.572
2018 2018-05-14 0 0.00 23.96
2018 2018-05-14 0 0.00 20.88
2018 2018-05-14 0 0.00 7.86
2018 2018-05-14 0 0.00 21.39

HAA6Br

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-08-13 0 0.00 10.115
2018 2018-08-13 0 0.00 10.249
2018 2018-08-13 0 0.00 12.616
2018 2018-08-13 0 0.00 6.066
2018 2018-08-13 0 0.00 4.953
2018 2018-08-13 0 0.00 12.853
2018 2018-08-13 0 0.00 8.486
2018 2018-08-13 0 0.00 12.733
2018 2018-05-14 0 0.00 8.538
2018 2018-05-14 0 0.00 8.777
2018 2018-05-14 0 0.00 5.487
2018 2018-05-14 0 0.00 9.437
2018 2018-05-14 0 0.00 12.49
2018 2018-05-14 0 0.00 11.71
2018 2018-05-14 0 0.00 6.67
2018 2018-05-14 0 0.00 11.86

HAA9

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-08-13 0 0.00 28.365
2018 2018-08-13 0 0.00 28.739
2018 2018-08-13 0 0.00 29.056
2018 2018-08-13 0 0.00 23.746
2018 2018-08-13 0 0.00 12.433
2018 2018-08-13 0 0.00 28.523
2018 2018-08-13 0 0.00 12.555
2018 2018-08-13 0 0.00 28.873
2018 2018-05-14 0 0.00 26.138
2018 2018-05-14 0 0.00 27.307
2018 2018-05-14 0 0.00 12.897
2018 2018-05-14 0 0.00 25.107
2018 2018-05-14 0 0.00 35.13
2018 2018-05-14 0 0.00 31.46
2018 2018-05-14 0 0.00 13.1
2018 2018-05-14 0 0.00 32.08

alpha-hexachlorocyclohexane

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.01 0.00 < 0.01
2018 2018-05-07 0.01 0.00 < 0.01
2018 2018-02-07 0.01 0.00 < 0.01
2018 2018-02-07 0.01 0.00 < 0.01
2018 2018-02-07 0.01 0.00 < 0.01

chlorpyrifos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.03 0.00 < 0.03
2018 2018-05-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03

dimethipin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.2 0.00 < 0.2
2018 2018-05-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2

ethoprop

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.03 0.00 < 0.03
2018 2018-05-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03
2018 2018-02-07 0.03 0.00 < 0.03

germanium

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.3 0.00 < 0.3
2018 2018-05-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3

manganese

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.4 0.00 1.4
2018 2018-05-07 0.4 0.00 12.2
2018 2018-02-07 0.4 0.00 < 0.4
2018 2018-02-07 0.4 0.00 < 0.4
2018 2018-02-07 0.4 0.00 1.17

oxyfluorfen

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.05 0.00 < 0.05
2018 2018-05-07 0.05 0.00 < 0.05
2018 2018-02-07 0.05 0.00 < 0.05
2018 2018-02-07 0.05 0.00 < 0.05
2018 2018-02-07 0.05 0.00 < 0.05

profenofos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.3 0.00 < 0.3
2018 2018-05-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3
2018 2018-02-07 0.3 0.00 < 0.3

tebuconazole

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.2 0.00 < 0.2
2018 2018-05-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2
2018 2018-02-07 0.2 0.00 < 0.2

total permethrin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.04 0.00 < 0.04
2018 2018-05-07 0.04 0.00 < 0.04
2018 2018-02-07 0.04 0.00 < 0.04
2018 2018-02-07 0.04 0.00 < 0.04
2018 2018-02-07 0.04 0.00 < 0.04

tribufos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-05-07 0.07 0.00 < 0.07
2018 2018-05-07 0.07 0.00 < 0.07
2018 2018-02-07 0.07 0.00 < 0.07
2018 2018-02-07 0.07 0.00 < 0.07
2018 2018-02-07 0.07 0.00 < 0.07

total microcystin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-08-06 0.3 0.00 < 0.3
2018 2018-07-17 0.3 0.00 < 0.3
2018 2018-07-02 0.3 0.00 < 0.3

butylated hydroxyanisole

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-03-12 0.03 0.00 < 0.03

o-toluidine

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-03-12 0.007 0.00 0.00841

quinoline

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-03-12 0.02 0.00 < 0.02

chlorate

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2014 2014-08-04 20 210 96
2014 2014-08-04 20 210 84
2014 2014-08-04 20 210 100
2014 2014-08-04 20 210 420
2014 2014-05-05 20 210 21
2014 2014-05-05 20 210 37
2014 2014-05-05 20 210 52
2014 2014-05-05 20 210 26
2014 2014-05-05 20 210 36
2014 2014-05-05 20 210 170
2014 2014-02-03 20 210 41
2014 2014-02-03 20 210 52
2014 2014-02-03 20 210 44
2014 2014-02-03 20 210 59
2013 2013-11-04 20 210 70
2013 2013-11-04 20 210 54
2013 2013-11-04 20 210 79
2013 2013-11-04 20 210 65
2013 2013-11-04 20 210 48
2013 2013-11-04 20 210 230

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
chromium 0.2 100 0.1255 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.2 100 < 0.2
2014 2014-08-04 0.2 100 0.39
2014 2014-08-04 0.2 100 < 0.2
2014 2014-08-04 0.2 100 0.28
2014 2014-05-05 0.2 100 0.5
2014 2014-05-05 0.2 100 0.24
2014 2014-05-05 0.2 100 < 0.2
2014 2014-05-05 0.2 100 0.38
2014 2014-05-05 0.2 100 < 0.2
2014 2014-05-05 0.2 100 0.24
2014 2014-02-03 0.2 100 < 0.2
2014 2014-02-03 0.2 100 < 0.2
2014 2014-02-03 0.2 100 < 0.2
2014 2014-02-03 0.2 100 < 0.2
2013 2013-11-04 0.2 100 0.25
2013 2013-11-04 0.2 100 < 0.2
2013 2013-11-04 0.2 100 < 0.2
2013 2013-11-04 0.2 100 0.23
2013 2013-11-04 0.2 100 < 0.2
2013 2013-11-04 0.2 100 < 0.2
chromium-6 0.03 0 0.1517 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.03 0 0.063
2014 2014-08-04 0.03 0 0.31
2014 2014-08-04 0.03 0 0.066
2014 2014-08-04 0.03 0 0.18
2014 2014-05-05 0.03 0 0.36
2014 2014-05-05 0.03 0 0.14
2014 2014-05-05 0.03 0 0.056
2014 2014-05-05 0.03 0 0.4
2014 2014-05-05 0.03 0 0.077
2014 2014-05-05 0.03 0 0.13
2014 2014-02-03 0.03 0 0.1
2014 2014-02-03 0.03 0 0.055
2014 2014-02-03 0.03 0 0.15
2014 2014-02-03 0.03 0 0.054
2013 2013-11-04 0.03 0 0.18
2013 2013-11-04 0.03 0 0.098
2013 2013-11-04 0.03 0 0.24
2013 2013-11-04 0.03 0 0.19
2013 2013-11-04 0.03 0 0.09
2013 2013-11-04 0.03 0 0.095
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 1 70 < 1
2014 2014-08-04 1 70 < 1
2014 2014-08-04 1 70 < 1
2014 2014-08-04 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-05-05 1 70 < 1
2014 2014-02-03 1 70 < 1
2014 2014-02-03 1 70 < 1
2014 2014-02-03 1 70 < 1
2014 2014-02-03 1 70 < 1
2013 2013-11-04 1 70 < 1
2013 2013-11-04 1 70 < 1
2013 2013-11-04 1 70 < 1
2013 2013-11-04 1 70 < 1
2013 2013-11-04 1 70 < 1
2013 2013-11-04 1 70 < 1
molybdenum 1 40 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 1 40 < 1
2014 2014-08-04 1 40 < 1
2014 2014-08-04 1 40 < 1
2014 2014-08-04 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-05-05 1 40 < 1
2014 2014-02-03 1 40 < 1
2014 2014-02-03 1 40 < 1
2014 2014-02-03 1 40 < 1
2014 2014-02-03 1 40 < 1
2013 2013-11-04 1 40 < 1
2013 2013-11-04 1 40 < 1
2013 2013-11-04 1 40 < 1
2013 2013-11-04 1 40 < 1
2013 2013-11-04 1 40 < 1
2013 2013-11-04 1 40 < 1
strontium 0.3 1500 103.05 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.3 1500 120
2014 2014-08-04 0.3 1500 50
2014 2014-08-04 0.3 1500 130
2014 2014-08-04 0.3 1500 71
2014 2014-05-05 0.3 1500 210
2014 2014-05-05 0.3 1500 47
2014 2014-05-05 0.3 1500 46
2014 2014-05-05 0.3 1500 200
2014 2014-05-05 0.3 1500 48
2014 2014-05-05 0.3 1500 58
2014 2014-02-03 0.3 1500 60
2014 2014-02-03 0.3 1500 140
2014 2014-02-03 0.3 1500 56
2014 2014-02-03 0.3 1500 82
2013 2013-11-04 0.3 1500 190
2013 2013-11-04 0.3 1500 130
2013 2013-11-04 0.3 1500 50
2013 2013-11-04 0.3 1500 180
2013 2013-11-04 0.3 1500 120
2013 2013-11-04 0.3 1500 73
vanadium 0.2 21 0.1795 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.2 21 < 0.2
2014 2014-08-04 0.2 21 < 0.2
2014 2014-08-04 0.2 21 < 0.2
2014 2014-08-04 0.2 21 < 0.2
2014 2014-05-05 0.2 21 0.82
2014 2014-05-05 0.2 21 < 0.2
2014 2014-05-05 0.2 21 < 0.2
2014 2014-05-05 0.2 21 0.83
2014 2014-05-05 0.2 21 < 0.2
2014 2014-05-05 0.2 21 < 0.2
2014 2014-02-03 0.2 21 < 0.2
2014 2014-02-03 0.2 21 < 0.2
2014 2014-02-03 0.2 21 < 0.2
2014 2014-02-03 0.2 21 < 0.2
2013 2013-11-04 0.2 21 1
2013 2013-11-04 0.2 21 < 0.2
2013 2013-11-04 0.2 21 < 0.2
2013 2013-11-04 0.2 21 0.94
2013 2013-11-04 0.2 21 < 0.2
2013 2013-11-04 0.2 21 < 0.2
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.03 6.14 < 0.03
2014 2014-08-04 0.03 6.14 < 0.03
2014 2014-05-05 0.03 6.14 < 0.03
2014 2014-05-05 0.03 6.14 < 0.03
2014 2014-05-05 0.03 6.14 < 0.03
2014 2014-02-03 0.03 6.14 < 0.03
2014 2014-02-03 0.03 6.14 < 0.03
2013 2013-11-04 0.03 6.14 < 0.03
2013 2013-11-04 0.03 6.14 < 0.03
2013 2013-11-04 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
2014 2014-08-04 0.03 0.0004 < 0.03
2014 2014-08-04 0.03 0.0004 < 0.03
2014 2014-05-05 0.03 0.0004 < 0.03
2014 2014-05-05 0.03 0.0004 < 0.03
2014 2014-05-05 0.03 0.0004 < 0.03
2014 2014-02-03 0.03 0.0004 < 0.03
2014 2014-02-03 0.03 0.0004 < 0.03
2013 2013-11-04 0.03 0.0004 < 0.03
2013 2013-11-04 0.03 0.0004 < 0.03
2013 2013-11-04 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
2014 2014-08-04 0.1 0.0103 < 0.1
2014 2014-08-04 0.1 0.0103 < 0.1
2014 2014-05-05 0.1 0.0103 < 0.1
2014 2014-05-05 0.1 0.0103 < 0.1
2014 2014-05-05 0.1 0.0103 < 0.1
2014 2014-02-03 0.1 0.0103 < 0.1
2014 2014-02-03 0.1 0.0103 < 0.1
2013 2013-11-04 0.1 0.0103 < 0.1
2013 2013-11-04 0.1 0.0103 < 0.1
2013 2013-11-04 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
2014 2014-08-04 0.07 0.35 < 0.07
2014 2014-08-04 0.07 0.35 < 0.07
2014 2014-05-05 0.07 0.35 < 0.07
2014 2014-05-05 0.07 0.35 < 0.07
2014 2014-05-05 0.07 0.35 < 0.07
2014 2014-02-03 0.07 0.35 < 0.07
2014 2014-02-03 0.07 0.35 < 0.07
2013 2013-11-04 0.07 0.35 < 0.07
2013 2013-11-04 0.07 0.35 < 0.07
2013 2013-11-04 0.07 0.35 < 0.07
17-alpha-ethynylestradiol 0.0009 0.035 < 0.0009 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.0009 0.035 < 0.0009
2014 2014-08-04 0.0009 0.035 < 0.0009
2014 2014-05-05 0.0009 0.035 < 0.0009
2014 2014-05-05 0.0009 0.035 < 0.0009
2014 2014-05-05 0.0009 0.035 < 0.0009
2014 2014-02-03 0.0009 0.035 < 0.0009
2014 2014-02-03 0.0009 0.035 < 0.0009
2013 2013-11-04 0.0009 0.035 < 0.0009
2013 2013-11-04 0.0009 0.035 < 0.0009
2013 2013-11-04 0.0009 0.035 < 0.0009
17-beta-estradiol 0.0004 0.0009 < 0.0004 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.0004 0.0009 < 0.0004
2014 2014-08-04 0.0004 0.0009 < 0.0004
2014 2014-05-05 0.0004 0.0009 < 0.0004
2014 2014-05-05 0.0004 0.0009 < 0.0004
2014 2014-05-05 0.0004 0.0009 < 0.0004
2014 2014-02-03 0.0004 0.0009 < 0.0004
2014 2014-02-03 0.0004 0.0009 < 0.0004
2013 2013-11-04 0.0004 0.0009 < 0.0004
2013 2013-11-04 0.0004 0.0009 < 0.0004
2013 2013-11-04 0.0004 0.0009 < 0.0004
4-androstene-3,17-dione 0.0003 0 < 0.0003 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.0003 0 < 0.0003
2014 2014-08-04 0.0003 0 < 0.0003
2014 2014-05-05 0.0003 0 < 0.0003
2014 2014-05-05 0.0003 0 < 0.0003
2014 2014-05-05 0.0003 0 < 0.0003
2014 2014-02-03 0.0003 0 < 0.0003
2014 2014-02-03 0.0003 0 < 0.0003
2013 2013-11-04 0.0003 0 < 0.0003
2013 2013-11-04 0.0003 0 < 0.0003
2013 2013-11-04 0.0003 0 < 0.0003
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.2 140 < 0.2
2014 2014-08-04 0.2 140 < 0.2
2014 2014-05-05 0.2 140 < 0.2
2014 2014-05-05 0.2 140 < 0.2
2014 2014-05-05 0.2 140 < 0.2
2014 2014-02-03 0.2 140 < 0.2
2014 2014-02-03 0.2 140 < 0.2
2013 2013-11-04 0.2 140 < 0.2
2013 2013-11-04 0.2 140 < 0.2
2013 2013-11-04 0.2 140 < 0.2
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.2 2.69 < 0.2
2014 2014-08-04 0.2 2.69 < 0.2
2014 2014-05-05 0.2 2.69 < 0.2
2014 2014-05-05 0.2 2.69 < 0.2
2014 2014-05-05 0.2 2.69 < 0.2
2014 2014-02-03 0.2 2.69 < 0.2
2014 2014-02-03 0.2 2.69 < 0.2
2013 2013-11-04 0.2 2.69 < 0.2
2013 2013-11-04 0.2 2.69 < 0.2
2013 2013-11-04 0.2 2.69 < 0.2
equilin 0.004 0.35 < 0.004 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.004 0.35 < 0.004
2014 2014-08-04 0.004 0.35 < 0.004
2014 2014-05-05 0.004 0.35 < 0.004
2014 2014-05-05 0.004 0.35 < 0.004
2014 2014-05-05 0.004 0.35 < 0.004
2014 2014-02-03 0.004 0.35 < 0.004
2014 2014-02-03 0.004 0.35 < 0.004
2013 2013-11-04 0.004 0.35 < 0.004
2013 2013-11-04 0.004 0.35 < 0.004
2013 2013-11-04 0.004 0.35 < 0.004
estriol 0.0008 0.35 < 0.0008 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.0008 0.35 < 0.0008
2014 2014-08-04 0.0008 0.35 < 0.0008
2014 2014-05-05 0.0008 0.35 < 0.0008
2014 2014-05-05 0.0008 0.35 < 0.0008
2014 2014-05-05 0.0008 0.35 < 0.0008
2014 2014-02-03 0.0008 0.35 < 0.0008
2014 2014-02-03 0.0008 0.35 < 0.0008
2013 2013-11-04 0.0008 0.35 < 0.0008
2013 2013-11-04 0.0008 0.35 < 0.0008
2013 2013-11-04 0.0008 0.35 < 0.0008
estrone 0.002 0.35 < 0.002 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.002 0.35 < 0.002
2014 2014-08-04 0.002 0.35 < 0.002
2014 2014-05-05 0.002 0.35 < 0.002
2014 2014-05-05 0.002 0.35 < 0.002
2014 2014-05-05 0.002 0.35 < 0.002
2014 2014-02-03 0.002 0.35 < 0.002
2014 2014-02-03 0.002 0.35 < 0.002
2013 2013-11-04 0.002 0.35 < 0.002
2013 2013-11-04 0.002 0.35 < 0.002
2013 2013-11-04 0.002 0.35 < 0.002
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.06 90 < 0.06
2014 2014-08-04 0.06 90 < 0.06
2014 2014-05-05 0.06 90 < 0.06
2014 2014-05-05 0.06 90 < 0.06
2014 2014-05-05 0.06 90 < 0.06
2014 2014-02-03 0.06 90 < 0.06
2014 2014-02-03 0.06 90 < 0.06
2013 2013-11-04 0.06 90 < 0.06
2013 2013-11-04 0.06 90 < 0.06
2013 2013-11-04 0.06 90 < 0.06
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.08 0 < 0.08
2014 2014-08-04 0.08 0 < 0.08
2014 2014-05-05 0.08 0 < 0.08
2014 2014-05-05 0.08 0 < 0.08
2014 2014-05-05 0.08 0 < 0.08
2014 2014-02-03 0.08 0 < 0.08
2014 2014-02-03 0.08 0 < 0.08
2013 2013-11-04 0.08 0 < 0.08
2013 2013-11-04 0.08 0 < 0.08
2013 2013-11-04 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.09 0 < 0.09
2014 2014-08-04 0.09 0 < 0.09
2014 2014-05-05 0.09 0 < 0.09
2014 2014-05-05 0.09 0 < 0.09
2014 2014-05-05 0.09 0 < 0.09
2014 2014-02-03 0.09 0 < 0.09
2014 2014-02-03 0.09 0 < 0.09
2013 2013-11-04 0.09 0 < 0.09
2013 2013-11-04 0.09 0 < 0.09
2013 2013-11-04 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.01 0 < 0.01
2014 2014-08-04 0.01 0 < 0.01
2014 2014-05-05 0.01 0 < 0.01
2014 2014-05-05 0.01 0 < 0.01
2014 2014-05-05 0.01 0 < 0.01
2014 2014-02-03 0.01 0 < 0.01
2014 2014-02-03 0.01 0 < 0.01
2013 2013-11-04 0.01 0 < 0.01
2013 2013-11-04 0.01 0 < 0.01
2013 2013-11-04 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.03 0 < 0.03
2014 2014-08-04 0.03 0 < 0.03
2014 2014-05-05 0.03 0 < 0.03
2014 2014-05-05 0.03 0 < 0.03
2014 2014-05-05 0.03 0 < 0.03
2014 2014-02-03 0.03 0 < 0.03
2014 2014-02-03 0.03 0 < 0.03
2013 2013-11-04 0.03 0 < 0.03
2013 2013-11-04 0.03 0 < 0.03
2013 2013-11-04 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.02 0 < 0.02
2014 2014-08-04 0.02 0 < 0.02
2014 2014-05-05 0.02 0 < 0.02
2014 2014-05-05 0.02 0 < 0.02
2014 2014-05-05 0.02 0 < 0.02
2014 2014-02-03 0.02 0 < 0.02
2014 2014-02-03 0.02 0 < 0.02
2013 2013-11-04 0.02 0 < 0.02
2013 2013-11-04 0.02 0 < 0.02
2013 2013-11-04 0.02 0 < 0.02
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.02 0.07 < 0.02
2014 2014-08-04 0.02 0.07 < 0.02
2014 2014-05-05 0.02 0.07 < 0.02
2014 2014-05-05 0.02 0.07 < 0.02
2014 2014-05-05 0.02 0.07 < 0.02
2014 2014-02-03 0.02 0.07 < 0.02
2014 2014-02-03 0.02 0.07 < 0.02
2013 2013-11-04 0.02 0.07 < 0.02
2013 2013-11-04 0.02 0.07 < 0.02
2013 2013-11-04 0.02 0.07 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.04 0.07 < 0.04
2014 2014-08-04 0.04 0.07 < 0.04
2014 2014-05-05 0.04 0.07 < 0.04
2014 2014-05-05 0.04 0.07 < 0.04
2014 2014-05-05 0.04 0.07 < 0.04
2014 2014-02-03 0.04 0.07 < 0.04
2014 2014-02-03 0.04 0.07 < 0.04
2013 2013-11-04 0.04 0.07 < 0.04
2013 2013-11-04 0.04 0.07 < 0.04
2013 2013-11-04 0.04 0.07 < 0.04
testosterone 0.0001 0 < 0.0001 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.0001 0 < 0.0001
2014 2014-08-04 0.0001 0 < 0.0001
2014 2014-05-05 0.0001 0 < 0.0001
2014 2014-05-05 0.0001 0 < 0.0001
2014 2014-05-05 0.0001 0 < 0.0001
2014 2014-02-03 0.0001 0 < 0.0001
2014 2014-02-03 0.0001 0 < 0.0001
2013 2013-11-04 0.0001 0 < 0.0001
2013 2013-11-04 0.0001 0 < 0.0001
2013 2013-11-04 0.0001 0 < 0.0001

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
CA64004 lead 2016-01-01 2018-12-31 0mg/L
CA49536 lead 2013-01-01 2015-12-31 0mg/L
211000212235LT5 lead 2012-01-01 2012-12-31 0.005mg/L
CA36786 lead 2010-01-01 2012-12-31 0mg/L
211000209273LT4 lead 2009-01-01 2009-12-31 0.005mg/L
211000208221LT4 lead 2008-01-01 2008-12-31 0.005mg/L

Violations


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

No violations found for Marin Municipal Water District.


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
CM Analytical, Inc. Gilroy, CA 95020
Alpha Analytical Laboratories Inc. Petaluma, CA 94952

Water Bill Information


Convenient information about your water service.

Unable to identify any billing information about Marin Municipal Water District (CA2110002).

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.