Public Water System: Marin Municipal Water District

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

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)
chlorate chlorate

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).

chlorate
Is this in your home's pipes?

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

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
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
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
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
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
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
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
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
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
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
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
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 < 0.2
2014 2014-05-05 0.2 21 0.82
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 2014-05-05 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 0.94
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 < 0.2
2013 2013-11-04 0.2 21 < 0.2
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
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 130
2014 2014-08-04 0.3 1500 120
2014 2014-08-04 0.3 1500 71
2014 2014-08-04 0.3 1500 50
2014 2014-05-05 0.3 1500 200
2014 2014-05-05 0.3 1500 47
2014 2014-05-05 0.3 1500 210
2014 2014-05-05 0.3 1500 58
2014 2014-05-05 0.3 1500 46
2014 2014-05-05 0.3 1500 48
2014 2014-02-03 0.3 1500 60
2014 2014-02-03 0.3 1500 82
2014 2014-02-03 0.3 1500 140
2014 2014-02-03 0.3 1500 56
2013 2013-11-04 0.3 1500 180
2013 2013-11-04 0.3 1500 130
2013 2013-11-04 0.3 1500 190
2013 2013-11-04 0.3 1500 73
2013 2013-11-04 0.3 1500 50
2013 2013-11-04 0.3 1500 120
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
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
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
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 < 0.2
2014 2014-08-04 0.2 100 0.28
2014 2014-08-04 0.2 100 0.39
2014 2014-05-05 0.2 100 0.38
2014 2014-05-05 0.2 100 0.24
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 < 0.2
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
2014 2014-02-03 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 0.25
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 < 0.2
chromium-6 0.03 0 0.1517 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-08-04 0.03 0 0.066
2014 2014-08-04 0.03 0 0.18
2014 2014-08-04 0.03 0 0.063
2014 2014-08-04 0.03 0 0.31
2014 2014-05-05 0.03 0 0.4
2014 2014-05-05 0.03 0 0.14
2014 2014-05-05 0.03 0 0.36
2014 2014-05-05 0.03 0 0.13
2014 2014-05-05 0.03 0 0.056
2014 2014-05-05 0.03 0 0.077
2014 2014-02-03 0.03 0 0.15
2014 2014-02-03 0.03 0 0.1
2014 2014-02-03 0.03 0 0.054
2014 2014-02-03 0.03 0 0.055
2013 2013-11-04 0.03 0 0.19
2013 2013-11-04 0.03 0 0.098
2013 2013-11-04 0.03 0 0.18
2013 2013-11-04 0.03 0 0.095
2013 2013-11-04 0.03 0 0.24
2013 2013-11-04 0.03 0 0.09
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
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
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
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
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
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

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
CA49536 lead 2013-01-01 2015-12-31 0mg/L
CA36786 lead 2010-01-01 2012-12-31 0mg/L
211000212235LT5 lead 2012-01-01 2012-12-31 0.005mg/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.


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.