Public Water System: Coastside County 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: CA4110011
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Surface water
Population Served: 18,871
Contact Information
DICKSON, DAVE
DICKSON, DAVE
766 Main Street
HALF MOON BAY, CA 94019

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   (1)
chlorate 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
2015 2015-12-14 20 210 380
2014 2014-12-30 20 210 470
2014 2014-09-15 20 210 230
2014 2014-09-15 20 210 660
2014 2014-09-15 20 210 390
2014 2014-06-17 20 210 320
2014 2014-06-17 20 210 330
2014 2014-06-17 20 210 350
2014 2014-06-17 20 210 180
2014 2014-03-11 20 210 180
2014 2014-03-11 20 210 290
2014 2014-03-11 20 210 300
2014 2014-03-11 20 210 230
2013 2013-12-11 20 210 360
2013 2013-12-11 20 210 340
2013 2013-12-11 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
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.03 0 < 0.03
2015 2015-01-20 0.03 0 < 0.03
2014 2014-09-15 0.03 0 < 0.03
2014 2014-06-17 0.03 0 < 0.03
2014 2014-06-17 0.03 0 < 0.03
2014 2014-03-11 0.03 0 < 0.03
2014 2014-03-11 0.03 0 < 0.03
2013 2013-12-11 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.02 0 < 0.02
2015 2015-01-20 0.02 0 < 0.02
2014 2014-09-15 0.02 0 < 0.02
2014 2014-06-17 0.02 0 < 0.02
2014 2014-06-17 0.02 0 < 0.02
2014 2014-03-11 0.02 0 < 0.02
2014 2014-03-11 0.02 0 < 0.02
2013 2013-12-11 0.02 0 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.04 0.07 < 0.04
2015 2015-01-20 0.04 0.07 < 0.04
2014 2014-09-15 0.04 0.07 < 0.04
2014 2014-06-17 0.04 0.07 < 0.04
2014 2014-06-17 0.04 0.07 < 0.04
2014 2014-03-11 0.04 0.07 < 0.04
2014 2014-03-11 0.04 0.07 < 0.04
2013 2013-12-11 0.04 0.07 < 0.04
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.02 0.07 < 0.02
2015 2015-01-20 0.02 0.07 < 0.02
2014 2014-09-15 0.02 0.07 < 0.02
2014 2014-06-17 0.02 0.07 < 0.02
2014 2014-06-17 0.02 0.07 < 0.02
2014 2014-03-11 0.02 0.07 < 0.02
2014 2014-03-11 0.02 0.07 < 0.02
2013 2013-12-11 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
2015 2015-12-14 0.03 6.14 < 0.03
2014 2014-12-30 0.03 6.14 < 0.03
2014 2014-09-15 0.03 6.14 < 0.03
2014 2014-06-17 0.03 6.14 < 0.03
2014 2014-06-17 0.03 6.14 < 0.03
2014 2014-03-11 0.03 6.14 < 0.03
2014 2014-03-11 0.03 6.14 < 0.03
2013 2013-12-11 0.03 6.14 < 0.03
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.01 0 < 0.01
2015 2015-01-20 0.01 0 < 0.01
2014 2014-09-15 0.01 0 < 0.01
2014 2014-06-17 0.01 0 < 0.01
2014 2014-06-17 0.01 0 < 0.01
2014 2014-03-11 0.01 0 < 0.01
2014 2014-03-11 0.01 0 < 0.01
2013 2013-12-11 0.01 0 < 0.01
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.1 0.0103 < 0.1
2014 2014-12-30 0.1 0.0103 < 0.1
2014 2014-09-15 0.1 0.0103 < 0.1
2014 2014-06-17 0.1 0.0103 < 0.1
2014 2014-06-17 0.1 0.0103 < 0.1
2014 2014-03-11 0.1 0.0103 < 0.1
2014 2014-03-11 0.1 0.0103 < 0.1
2013 2013-12-11 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
2015 2015-12-14 0.07 0.35 < 0.07
2014 2014-12-30 0.07 0.35 < 0.07
2014 2014-09-15 0.07 0.35 < 0.07
2014 2014-06-17 0.07 0.35 < 0.07
2014 2014-06-17 0.07 0.35 < 0.07
2014 2014-03-11 0.07 0.35 < 0.07
2014 2014-03-11 0.07 0.35 < 0.07
2013 2013-12-11 0.07 0.35 < 0.07
chromium 0.2 100 0.2806 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.2 100 1.2
2014 2014-12-30 0.2 100 < 0.2
2014 2014-09-15 0.2 100 0.21
2014 2014-09-15 0.2 100 < 0.2
2014 2014-09-15 0.2 100 < 0.2
2014 2014-06-17 0.2 100 < 0.2
2014 2014-06-17 0.2 100 < 0.2
2014 2014-06-17 0.2 100 0.82
2014 2014-06-17 0.2 100 < 0.2
2014 2014-03-11 0.2 100 < 0.2
2014 2014-03-11 0.2 100 0.2
2014 2014-03-11 0.2 100 1.5
2014 2014-03-11 0.2 100 < 0.2
2013 2013-12-11 0.2 100 < 0.2
2013 2013-12-11 0.2 100 0.56
2013 2013-12-11 0.2 100 < 0.2
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.08 0 < 0.08
2014 2014-12-30 0.08 0 < 0.08
2014 2014-09-15 0.08 0 < 0.08
2014 2014-06-17 0.08 0 < 0.08
2014 2014-06-17 0.08 0 < 0.08
2014 2014-03-11 0.08 0 < 0.08
2014 2014-03-11 0.08 0 < 0.08
2013 2013-12-11 0.08 0 < 0.08
vanadium 0.2 21 0.1194 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.2 21 < 0.2
2014 2014-12-30 0.2 21 < 0.2
2014 2014-09-15 0.2 21 0.28
2014 2014-09-15 0.2 21 0.23
2014 2014-09-15 0.2 21 < 0.2
2014 2014-06-17 0.2 21 < 0.2
2014 2014-06-17 0.2 21 < 0.2
2014 2014-06-17 0.2 21 0.22
2014 2014-06-17 0.2 21 < 0.2
2014 2014-03-11 0.2 21 0.24
2014 2014-03-11 0.2 21 0.23
2014 2014-03-11 0.2 21 0.22
2014 2014-03-11 0.2 21 < 0.2
2013 2013-12-11 0.2 21 0.26
2013 2013-12-11 0.2 21 0.23
2013 2013-12-11 0.2 21 < 0.2
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.09 0 < 0.09
2015 2015-01-20 0.09 0 < 0.09
2014 2014-09-15 0.09 0 < 0.09
2014 2014-06-17 0.09 0 < 0.09
2014 2014-06-17 0.09 0 < 0.09
2014 2014-03-11 0.09 0 < 0.09
2014 2014-03-11 0.09 0 < 0.09
2013 2013-12-11 0.09 0 < 0.09
strontium 0.3 1500 52.75 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.3 1500 57
2014 2014-12-30 0.3 1500 71
2014 2014-09-15 0.3 1500 41
2014 2014-09-15 0.3 1500 40
2014 2014-09-15 0.3 1500 35
2014 2014-06-17 0.3 1500 72
2014 2014-06-17 0.3 1500 37
2014 2014-06-17 0.3 1500 53
2014 2014-06-17 0.3 1500 43
2014 2014-03-11 0.3 1500 59
2014 2014-03-11 0.3 1500 54
2014 2014-03-11 0.3 1500 71
2014 2014-03-11 0.3 1500 50
2013 2013-12-11 0.3 1500 54
2013 2013-12-11 0.3 1500 58
2013 2013-12-11 0.3 1500 49
chromium-6 0.03 0 0.1635 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.03 0 0.87
2014 2014-12-30 0.03 0 < 0.03
2014 2014-09-15 0.03 0 0.11
2014 2014-09-15 0.03 0 0.093
2014 2014-09-15 0.03 0 0.038
2014 2014-06-17 0.03 0 < 0.03
2014 2014-06-17 0.03 0 0.051
2014 2014-06-17 0.03 0 0.83
2014 2014-06-17 0.03 0 0.04
2014 2014-03-11 0.03 0 0.054
2014 2014-03-11 0.03 0 0.11
2014 2014-03-11 0.03 0 0.072
2014 2014-03-11 0.03 0 0.074
2013 2013-12-11 0.03 0 0.14
2013 2013-12-11 0.03 0 0.08
2013 2013-12-11 0.03 0 0.054
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.2 2.69 < 0.2
2014 2014-12-30 0.2 2.69 < 0.2
2014 2014-09-15 0.2 2.69 < 0.2
2014 2014-06-17 0.2 2.69 < 0.2
2014 2014-06-17 0.2 2.69 < 0.2
2014 2014-03-11 0.2 2.69 < 0.2
2014 2014-03-11 0.2 2.69 < 0.2
2013 2013-12-11 0.2 2.69 < 0.2
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.2 140 < 0.2
2014 2014-12-30 0.2 140 < 0.2
2014 2014-09-15 0.2 140 < 0.2
2014 2014-06-17 0.2 140 < 0.2
2014 2014-06-17 0.2 140 < 0.2
2014 2014-03-11 0.2 140 < 0.2
2014 2014-03-11 0.2 140 < 0.2
2013 2013-12-11 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
2015 2015-12-14 0.03 0.0004 < 0.03
2014 2014-12-30 0.03 0.0004 < 0.03
2014 2014-09-15 0.03 0.0004 < 0.03
2014 2014-06-17 0.03 0.0004 < 0.03
2014 2014-06-17 0.03 0.0004 < 0.03
2014 2014-03-11 0.03 0.0004 < 0.03
2014 2014-03-11 0.03 0.0004 < 0.03
2013 2013-12-11 0.03 0.0004 < 0.03
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 0.06 90 < 0.06
2014 2014-12-30 0.06 90 < 0.06
2014 2014-09-15 0.06 90 < 0.06
2014 2014-06-17 0.06 90 < 0.06
2014 2014-06-17 0.06 90 < 0.06
2014 2014-03-11 0.06 90 < 0.06
2014 2014-03-11 0.06 90 < 0.06
2013 2013-12-11 0.06 90 < 0.06
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 1 70 < 1
2014 2014-12-30 1 70 < 1
2014 2014-09-15 1 70 < 1
2014 2014-09-15 1 70 < 1
2014 2014-09-15 1 70 < 1
2014 2014-06-17 1 70 < 1
2014 2014-06-17 1 70 < 1
2014 2014-06-17 1 70 < 1
2014 2014-06-17 1 70 < 1
2014 2014-03-11 1 70 < 1
2014 2014-03-11 1 70 < 1
2014 2014-03-11 1 70 < 1
2014 2014-03-11 1 70 < 1
2013 2013-12-11 1 70 < 1
2013 2013-12-11 1 70 < 1
2013 2013-12-11 1 70 < 1
molybdenum 1 40 0.6375 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-12-14 1 40 2
2014 2014-12-30 1 40 2.1
2014 2014-09-15 1 40 < 1
2014 2014-09-15 1 40 < 1
2014 2014-09-15 1 40 < 1
2014 2014-06-17 1 40 2.2
2014 2014-06-17 1 40 < 1
2014 2014-06-17 1 40 < 1
2014 2014-06-17 1 40 < 1
2014 2014-03-11 1 40 2.8
2014 2014-03-11 1 40 < 1
2014 2014-03-11 1 40 1.1
2014 2014-03-11 1 40 < 1
2013 2013-12-11 1 40 < 1
2013 2013-12-11 1 40 < 1
2013 2013-12-11 1 40 < 1

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
CA51323 lead 2014-01-01 2016-12-31 0.007mg/L
CA38828 lead 2011-01-01 2013-12-31 0.005mg/L
411001111273LT4 lead 2011-01-01 2011-12-31 0.056mg/L
411001111093L lead 2011-01-01 2011-12-31 0.022mg/L
411001111179LT4 lead 2011-01-01 2011-12-31 0.056mg/L
411001111214LA1 lead 2011-01-01 2011-12-31 0.0033mg/L
411001111223L2ND 6 lead 2011-01-01 2011-12-31 0.013mg/L
411001111270LT1 lead 2011-01-01 2011-12-31 0.0058mg/L
411001111271LA2 lead 2011-01-01 2011-12-31 0.0054mg/L
411001109209L1ST 6 lead 2009-01-01 2009-12-31 0.013mg/L
411001108183LT3 lead 2008-01-01 2008-12-31 0.0054mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2008-04-01 - 2008-04-30 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance
2005-06-01 - 2005-06-30 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance
2005-02-01 - 2005-02-28 Surface Water Treatment Rule Monitoring of Treatment (SWTR-Filter) Surface Water Treatment Rule Returned to Compliance
2004-01-01 - 2004-01-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2003-07-01 - 2003-07-31 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Known
2002-01-01 - 2002-01-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2001-10-01 - 2001-12-31 Nitrates Monitoring, Regular Nitrate Known
2001-07-01 - 2001-09-30 Nitrates Monitoring, Regular Nitrate Known
1993-06-30 - 2000-04-04 Lead and Copper Rule Initial Tap Sampling for Pb and Cu Lead and Copper Rule Returned to Compliance
1998-11-01 - 1998-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
1996-02-07 - 1996-03-31 Total Coliform Rule Notification, State Coliform (TCR) Known
1996-02-01 - 1996-03-31 Total Coliform Rule Monitoring, Repeat Minor (TCR) Coliform (TCR) Known
1996-02-01 - 1996-02-29 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
1992-06-01 - 1992-07-31 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Known

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.