Public Water System: California Water Service - San Mateo

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: CA4110008
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Surface water purchased
Population Served: 101,004
Contact Information
JAMES, SOPHIE
JAMES, SOPHIE
1720 NORTH FIRST STREET
SAN JOSE, CA 95112-4508

This public water system services 6 zip codes 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 2014-10-15 20 210 320
2014 2014-10-15 20 210 280
2014 2014-07-09 20 210 140
2014 2014-07-08 20 210 140
2014 2014-04-01 20 210 66
2014 2014-04-01 20 210 65
2014 2014-01-06 20 210 97
2014 2014-01-06 20 210 99

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
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.02 0 < 0.02
2014 2014-07-09 0.02 0 < 0.02
2014 2014-04-01 0.02 0 < 0.02
2014 2014-01-06 0.02 0 < 0.02
chromium 0.2 100 0.1375 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-04 0.2 100 1.1
2015 2015-04-20 0.2 100 < 0.2
2014 2014-10-15 0.2 100 < 0.2
2014 2014-07-09 0.2 100 < 0.2
2014 2014-04-01 0.2 100 < 0.2
2014 2014-04-01 0.2 100 < 0.2
2014 2014-01-06 0.2 100 < 0.2
2014 2014-01-06 0.2 100 < 0.2
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.03 6.14 < 0.03
2014 2014-07-09 0.03 6.14 < 0.03
2014 2014-04-01 0.03 6.14 < 0.03
2014 2014-01-06 0.03 6.14 < 0.03
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.02 0.07 < 0.02
2014 2014-07-09 0.02 0.07 < 0.02
2014 2014-04-01 0.02 0.07 < 0.02
2014 2014-01-06 0.02 0.07 < 0.02
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.03 0.0004 < 0.03
2014 2014-07-09 0.03 0.0004 < 0.03
2014 2014-04-01 0.03 0.0004 < 0.03
2014 2014-01-06 0.03 0.0004 < 0.03
molybdenum 1 40 0.1625 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-04 1 40 1.3
2015 2015-04-20 1 40 < 1
2014 2014-10-15 1 40 < 1
2014 2014-07-09 1 40 < 1
2014 2014-04-01 1 40 < 1
2014 2014-04-01 1 40 < 1
2014 2014-01-06 1 40 < 1
2014 2014-01-06 1 40 < 1
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.04 0.07 < 0.04
2014 2014-07-09 0.04 0.07 < 0.04
2014 2014-04-01 0.04 0.07 < 0.04
2014 2014-01-06 0.04 0.07 < 0.04
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.03 0 < 0.03
2014 2014-07-09 0.03 0 < 0.03
2014 2014-04-01 0.03 0 < 0.03
2014 2014-01-06 0.03 0 < 0.03
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.01 0 < 0.01
2014 2014-07-09 0.01 0 < 0.01
2014 2014-04-01 0.01 0 < 0.01
2014 2014-01-06 0.01 0 < 0.01
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.08 0 < 0.08
2014 2014-07-09 0.08 0 < 0.08
2014 2014-04-01 0.08 0 < 0.08
2014 2014-01-06 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.09 0 < 0.09
2014 2014-07-09 0.09 0 < 0.09
2014 2014-04-01 0.09 0 < 0.09
2014 2014-01-06 0.09 0 < 0.09
strontium 0.3 1500 137.125 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-04 0.3 1500 890
2015 2015-04-20 0.3 1500 19
2014 2014-10-15 0.3 1500 46
2014 2014-07-09 0.3 1500 14
2014 2014-04-01 0.3 1500 17
2014 2014-04-01 0.3 1500 15
2014 2014-01-06 0.3 1500 47
2014 2014-01-06 0.3 1500 49
chromium-6 0.03 0 0.044 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.03 0 0.045
2014 2014-10-15 0.03 0 0.035
2014 2014-07-09 0.03 0 0.032
2014 2014-07-08 0.03 0 0.03
2014 2014-04-01 0.03 0 0.03
2014 2014-04-01 0.03 0 0.033
2014 2014-01-06 0.03 0 0.076
2014 2014-01-06 0.03 0 0.071
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.2 140 < 0.2
2014 2014-07-09 0.2 140 < 0.2
2014 2014-04-01 0.2 140 < 0.2
2014 2014-01-06 0.2 140 < 0.2
vanadium 0.2 21 0.8438 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-04 0.2 21 6.1
2015 2015-04-20 0.2 21 < 0.2
2014 2014-10-15 0.2 21 0.21
2014 2014-07-09 0.2 21 < 0.2
2014 2014-04-01 0.2 21 < 0.2
2014 2014-04-01 0.2 21 < 0.2
2014 2014-01-06 0.2 21 0.23
2014 2014-01-06 0.2 21 0.21
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.07 0.35 < 0.07
2014 2014-07-09 0.07 0.35 < 0.07
2014 2014-04-01 0.07 0.35 < 0.07
2014 2014-01-06 0.07 0.35 < 0.07
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-06-04 1 70 < 1
2015 2015-04-20 1 70 < 1
2014 2014-10-15 1 70 < 1
2014 2014-07-09 1 70 < 1
2014 2014-04-01 1 70 < 1
2014 2014-04-01 1 70 < 1
2014 2014-01-06 1 70 < 1
2014 2014-01-06 1 70 < 1
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.2 2.69 < 0.2
2014 2014-07-09 0.2 2.69 < 0.2
2014 2014-04-01 0.2 2.69 < 0.2
2014 2014-01-06 0.2 2.69 < 0.2
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-10-15 0.06 90 < 0.06
2014 2014-07-09 0.06 90 < 0.06
2014 2014-04-01 0.06 90 < 0.06
2014 2014-01-06 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 2014-10-15 0.1 0.0103 < 0.1
2014 2014-07-09 0.1 0.0103 < 0.1
2014 2014-04-01 0.1 0.0103 < 0.1
2014 2014-01-06 0.1 0.0103 < 0.1

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
CA53861 lead 2016-01-01 2018-12-31 0mg/L
CA38914 lead 2013-01-01 2015-12-31 0.0088mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
1993-06-01 - 1993-06-30 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance
1992-10-01 - 1992-10-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (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.