Public Water System: Mammoth Cwd

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: CA2610001
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Surface water
Population Served: 8,214
Contact Information
HAYES, PATRICK
HAYES, PATRICK
PO Box 597
MAMMOTH LAKES, CA 93546

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   (0) 2014   (1) 2015   (0)
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 2014-10-14 20 210 < 20
2014 2014-10-14 20 210 27
2014 2014-07-14 20 210 < 20
2014 2014-07-14 20 210 < 20
2014 2014-07-14 20 210 63
2014 2014-07-14 20 210 74
2014 2014-07-14 20 210 78
2014 2014-07-14 20 210 88
2014 2014-04-14 20 210 < 20
2014 2014-04-14 20 210 22
2014 2014-01-21 20 210 < 20
2014 2014-01-21 20 210 < 20
2014 2014-01-21 20 210 23
2014 2014-01-21 20 210 46
2014 2014-01-21 20 210 60
2014 2014-01-21 20 210 220

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
chromium 0.2 100 0.0469 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.2 100 < 0.2
2014 2014-10-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 < 0.2
2014 2014-07-14 0.2 100 0.24
2014 2014-04-14 0.2 100 < 0.2
2014 2014-04-14 0.2 100 < 0.2
2014 2014-01-21 0.2 100 < 0.2
2014 2014-01-21 0.2 100 < 0.2
2014 2014-01-21 0.2 100 < 0.2
2014 2014-01-21 0.2 100 < 0.2
2014 2014-01-21 0.2 100 < 0.2
2014 2014-01-21 0.2 100 0.51
manganese 1 0 0.6313 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 1 0 < 1
2014 2014-10-14 1 0 < 1
2014 2014-07-14 1 0 < 1
2014 2014-07-14 1 0 < 1
2014 2014-07-14 1 0 < 1
2014 2014-07-14 1 0 < 1
2014 2014-07-14 1 0 < 1
2014 2014-07-14 1 0 1.5
2014 2014-04-14 1 0 < 1
2014 2014-04-14 1 0 2.6
2014 2014-01-21 1 0 < 1
2014 2014-01-21 1 0 < 1
2014 2014-01-21 1 0 < 1
2014 2014-01-21 1 0 < 1
2014 2014-01-21 1 0 1
2014 2014-01-21 1 0 5
strontium 0.3 1500 61.1625 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.3 1500 16.6
2014 2014-10-14 0.3 1500 27
2014 2014-07-14 0.3 1500 16
2014 2014-07-14 0.3 1500 37
2014 2014-07-14 0.3 1500 54
2014 2014-07-14 0.3 1500 90
2014 2014-07-14 0.3 1500 100
2014 2014-07-14 0.3 1500 100
2014 2014-04-14 0.3 1500 18
2014 2014-04-14 0.3 1500 38
2014 2014-01-21 0.3 1500 18
2014 2014-01-21 0.3 1500 40
2014 2014-01-21 0.3 1500 61
2014 2014-01-21 0.3 1500 93
2014 2014-01-21 0.3 1500 120
2014 2014-01-21 0.3 1500 150
chromium-6 0.03 0 0.0838 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.03 0 < 0.03
2014 2014-10-14 0.03 0 0.075
2014 2014-09-08 0.03 0 0.15
2014 2014-07-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 0.038
2014 2014-07-14 0.03 0 0.076
2014 2014-07-14 0.03 0 0.077
2014 2014-04-14 0.03 0 < 0.03
2014 2014-04-14 0.03 0 0.078
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 0.064
2014 2014-01-21 0.03 0 0.08
2014 2014-01-21 0.03 0 0.092
2014 2014-01-21 0.03 0 0.12
2014 2014-01-21 0.03 0 0.49
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 1 70 < 1
2014 2014-10-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-07-14 1 70 < 1
2014 2014-04-14 1 70 < 1
2014 2014-04-14 1 70 < 1
2014 2014-01-21 1 70 < 1
2014 2014-01-21 1 70 < 1
2014 2014-01-21 1 70 < 1
2014 2014-01-21 1 70 < 1
2014 2014-01-21 1 70 < 1
2014 2014-01-21 1 70 < 1
molybdenum 1 40 3.45 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 1 40 3.5
2014 2014-10-14 1 40 3.6
2014 2014-07-14 1 40 2.3
2014 2014-07-14 1 40 2.8
2014 2014-07-14 1 40 3.7
2014 2014-07-14 1 40 3.7
2014 2014-07-14 1 40 3.8
2014 2014-07-14 1 40 7.5
2014 2014-04-14 1 40 2.9
2014 2014-04-14 1 40 2.9
2014 2014-01-21 1 40 2.4
2014 2014-01-21 1 40 2.4
2014 2014-01-21 1 40 2.8
2014 2014-01-21 1 40 3.3
2014 2014-01-21 1 40 3.6
2014 2014-01-21 1 40 4
vanadium 0.2 21 2.5381 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.2 21 < 0.2
2014 2014-10-14 0.2 21 0.54
2014 2014-07-14 0.2 21 < 0.2
2014 2014-07-14 0.2 21 0.65
2014 2014-07-14 0.2 21 1.9
2014 2014-07-14 0.2 21 3.9
2014 2014-07-14 0.2 21 4.3
2014 2014-07-14 0.2 21 11
2014 2014-04-14 0.2 21 < 0.2
2014 2014-04-14 0.2 21 0.57
2014 2014-01-21 0.2 21 < 0.2
2014 2014-01-21 0.2 21 0.95
2014 2014-01-21 0.2 21 1.4
2014 2014-01-21 0.2 21 1.6
2014 2014-01-21 0.2 21 1.8
2014 2014-01-21 0.2 21 12
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.07 0.35 < 0.07
2014 2014-07-14 0.07 0.35 < 0.07
2014 2014-07-14 0.07 0.35 < 0.07
2014 2014-07-14 0.07 0.35 < 0.07
2014 2014-07-14 0.07 0.35 < 0.07
2014 2014-04-14 0.07 0.35 < 0.07
2014 2014-01-21 0.07 0.35 < 0.07
2014 2014-01-21 0.07 0.35 < 0.07
2014 2014-01-21 0.07 0.35 < 0.07
2014 2014-01-21 0.07 0.35 < 0.07
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.2 2.69 < 0.2
2014 2014-07-14 0.2 2.69 < 0.2
2014 2014-07-14 0.2 2.69 < 0.2
2014 2014-07-14 0.2 2.69 < 0.2
2014 2014-07-14 0.2 2.69 < 0.2
2014 2014-04-14 0.2 2.69 < 0.2
2014 2014-01-21 0.2 2.69 < 0.2
2014 2014-01-21 0.2 2.69 < 0.2
2014 2014-01-21 0.2 2.69 < 0.2
2014 2014-01-21 0.2 2.69 < 0.2
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.2 140 < 0.2
2014 2014-07-14 0.2 140 < 0.2
2014 2014-07-14 0.2 140 < 0.2
2014 2014-07-14 0.2 140 < 0.2
2014 2014-07-14 0.2 140 < 0.2
2014 2014-04-14 0.2 140 < 0.2
2014 2014-01-21 0.2 140 < 0.2
2014 2014-01-21 0.2 140 < 0.2
2014 2014-01-21 0.2 140 < 0.2
2014 2014-01-21 0.2 140 < 0.2
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.03 0.0004 < 0.03
2014 2014-07-14 0.03 0.0004 < 0.03
2014 2014-07-14 0.03 0.0004 < 0.03
2014 2014-07-14 0.03 0.0004 < 0.03
2014 2014-07-14 0.03 0.0004 < 0.03
2014 2014-04-14 0.03 0.0004 < 0.03
2014 2014-01-21 0.03 0.0004 < 0.03
2014 2014-01-21 0.03 0.0004 < 0.03
2014 2014-01-21 0.03 0.0004 < 0.03
2014 2014-01-21 0.03 0.0004 < 0.03
sec-butylbenzene 0.04 0 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.04 0 < 0.04
2014 2014-07-14 0.04 0 < 0.04
2014 2014-07-14 0.04 0 < 0.04
2014 2014-07-14 0.04 0 < 0.04
2014 2014-07-14 0.04 0 < 0.04
2014 2014-04-14 0.04 0 < 0.04
2014 2014-01-21 0.04 0 < 0.04
2014 2014-01-21 0.04 0 < 0.04
2014 2014-01-21 0.04 0 < 0.04
2014 2014-01-21 0.04 0 < 0.04
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.06 90 < 0.06
2014 2014-07-14 0.06 90 < 0.06
2014 2014-07-14 0.06 90 < 0.06
2014 2014-07-14 0.06 90 < 0.06
2014 2014-07-14 0.06 90 < 0.06
2014 2014-04-14 0.06 90 < 0.06
2014 2014-01-21 0.06 90 < 0.06
2014 2014-01-21 0.06 90 < 0.06
2014 2014-01-21 0.06 90 < 0.06
2014 2014-01-21 0.06 90 < 0.06
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.1 0.0103 < 0.1
2014 2014-07-14 0.1 0.0103 < 0.1
2014 2014-07-14 0.1 0.0103 < 0.1
2014 2014-07-14 0.1 0.0103 < 0.1
2014 2014-07-14 0.1 0.0103 < 0.1
2014 2014-04-14 0.1 0.0103 < 0.1
2014 2014-01-21 0.1 0.0103 < 0.1
2014 2014-01-21 0.1 0.0103 < 0.1
2014 2014-01-21 0.1 0.0103 < 0.1
2014 2014-01-21 0.1 0.0103 < 0.1
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.08 0 < 0.08
2014 2014-07-14 0.08 0 < 0.08
2014 2014-07-14 0.08 0 < 0.08
2014 2014-07-14 0.08 0 < 0.08
2014 2014-07-14 0.08 0 < 0.08
2014 2014-04-14 0.08 0 < 0.08
2014 2014-01-21 0.08 0 < 0.08
2014 2014-01-21 0.08 0 < 0.08
2014 2014-01-21 0.08 0 < 0.08
2014 2014-01-21 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.09 0 < 0.09
2014 2014-07-14 0.09 0 < 0.09
2014 2014-07-14 0.09 0 < 0.09
2014 2014-07-14 0.09 0 < 0.09
2014 2014-07-14 0.09 0 < 0.09
2014 2014-04-14 0.09 0 < 0.09
2014 2014-01-21 0.09 0 < 0.09
2014 2014-01-21 0.09 0 < 0.09
2014 2014-01-21 0.09 0 < 0.09
2014 2014-01-21 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.01 0 < 0.01
2014 2014-07-14 0.01 0 < 0.01
2014 2014-07-14 0.01 0 < 0.01
2014 2014-07-14 0.01 0 < 0.01
2014 2014-07-14 0.01 0 < 0.01
2014 2014-04-14 0.01 0 < 0.01
2014 2014-01-21 0.01 0 < 0.01
2014 2014-01-21 0.01 0 < 0.01
2014 2014-01-21 0.01 0 < 0.01
2014 2014-01-21 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 < 0.03
2014 2014-07-14 0.03 0 < 0.03
2014 2014-04-14 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.02 0 < 0.02
2014 2014-07-14 0.02 0 < 0.02
2014 2014-07-14 0.02 0 < 0.02
2014 2014-07-14 0.02 0 < 0.02
2014 2014-07-14 0.02 0 < 0.02
2014 2014-04-14 0.02 0 < 0.02
2014 2014-01-21 0.02 0 < 0.02
2014 2014-01-21 0.02 0 < 0.02
2014 2014-01-21 0.02 0 < 0.02
2014 2014-01-21 0.02 0 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.04 0.07 < 0.04
2014 2014-07-14 0.04 0.07 < 0.04
2014 2014-07-14 0.04 0.07 < 0.04
2014 2014-07-14 0.04 0.07 < 0.04
2014 2014-07-14 0.04 0.07 < 0.04
2014 2014-04-14 0.04 0.07 < 0.04
2014 2014-01-21 0.04 0.07 < 0.04
2014 2014-01-21 0.04 0.07 < 0.04
2014 2014-01-21 0.04 0.07 < 0.04
2014 2014-01-21 0.04 0.07 < 0.04
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.02 0.07 < 0.02
2014 2014-07-14 0.02 0.07 < 0.02
2014 2014-07-14 0.02 0.07 < 0.02
2014 2014-07-14 0.02 0.07 < 0.02
2014 2014-07-14 0.02 0.07 < 0.02
2014 2014-04-14 0.02 0.07 < 0.02
2014 2014-01-21 0.02 0.07 < 0.02
2014 2014-01-21 0.02 0.07 < 0.02
2014 2014-01-21 0.02 0.07 < 0.02
2014 2014-01-21 0.02 0.07 < 0.02
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-14 0.03 6.14 < 0.03
2014 2014-07-14 0.03 6.14 < 0.03
2014 2014-07-14 0.03 6.14 < 0.03
2014 2014-07-14 0.03 6.14 < 0.03
2014 2014-07-14 0.03 6.14 < 0.03
2014 2014-04-14 0.03 6.14 < 0.03
2014 2014-01-21 0.03 6.14 < 0.03
2014 2014-01-21 0.03 6.14 < 0.03
2014 2014-01-21 0.03 6.14 < 0.03
2014 2014-01-21 0.03 6.14 < 0.03
n-propylbenzene 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03
2014 2014-01-21 0.03 0 < 0.03

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
CA56037 lead 2017-01-01 2017-06-30 0mg/L
CA53789 lead 2016-07-01 2016-12-31 0mg/L
CA51316 lead 2016-01-01 2016-06-30 0mg/L
CA49159 lead 2015-01-01 2015-12-31 0mg/L
CA44569 copper 2015-01-01 2015-06-30 1.4mg/L
CA45315 lead 2015-01-01 2015-06-30 0.01mg/L
CA42023 lead 2014-07-01 2014-12-31 0.011mg/L
CA40134 lead 2014-01-01 2014-06-30 0.009mg/L
CA39624 lead 2013-07-01 2013-12-31 0mg/L
CA39605 lead 2013-01-01 2013-06-30 0.01mg/L
CA35844 copper 2012-07-01 2012-12-31 1.8mg/L
CA39592 lead 2012-07-01 2012-12-31 0.019mg/L
261000112090L lead 2012-01-01 2012-12-31 0.005mg/L
261000112241C copper 2012-01-01 2012-12-31 1.8mg/L
261000112241L lead 2012-01-01 2012-12-31 0.019mg/L
CA39577 lead 2012-01-01 2012-06-30 0.005mg/L
261000111273C copper 2011-01-01 2011-12-31 1.4mg/L
261000111273L lead 2011-01-01 2011-12-31 0.0075mg/L
261000110243L1ST 6 lead 2010-01-01 2010-12-31 0.0056mg/L
261000110081L1ST 6 lead 2010-01-01 2010-12-31 0.0081mg/L
261000109170CT1 copper 2009-01-01 2009-12-31 2mg/L
261000109253C2ND 6 copper 2009-01-01 2009-12-31 1.5mg/L
261000109253L2ND 6 lead 2009-01-01 2009-12-31 0.007mg/L
261000109260L2ND 6 lead 2009-01-01 2009-12-31 0.0069mg/L
261000108259C2ND 6 copper 2008-01-01 2008-12-31 1.5mg/L
261000108259L2ND 6 lead 2008-01-01 2008-12-31 0.0099mg/L
261000108060L1ST 6 lead 2008-01-01 2008-12-31 0.0058mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2016-08-01 - 2016-08-31 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance
1992-09-01 - 1992-09-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
1991-06-01 - 1991-06-30 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance

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.