Public Water System: Sonoma, City Of

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: CA4910012
Type: Community water system
EPA Region: 09
Primary Source: Ground water
Population Served: 11,654
Contact Information
FERGUSON, J. COLLEEN
FERGUSON, J. COLLEEN
No. 1 The Plaza
SONOMA, CA 95476

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)
vanadium vanadium

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).

vanadium
Is this in your home's pipes?

Year Test Date MRL HRL Test Result
2014 2014-01-07 0.2 21 23
2014 2014-01-07 0.2 21 20
2014 2014-01-07 0.2 21 0.92
2014 2014-01-07 0.2 21 24
2014 2014-01-07 0.2 21 8
2014 2014-01-07 0.2 21 < 0.2
2014 2014-01-07 0.2 21 24
2014 2014-01-07 0.2 21 0.76
2013 2013-08-22 0.2 21 28
2013 2013-07-18 0.2 21 26
2013 2013-07-18 0.2 21 10
2013 2013-07-18 0.2 21 4.4
2013 2013-07-18 0.2 21 22
2013 2013-07-18 0.2 21 23
2013 2013-07-18 0.2 21 < 0.2
2013 2013-07-18 0.2 21 1.2

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
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2014 2014-01-07 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
2013 2013-07-18 0.04 0.07 < 0.04
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2014 2014-01-07 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
2013 2013-07-18 0.2 2.69 < 0.2
chlorate 20 210 8.75 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 20 210 < 20
2014 2014-01-07 20 210 < 20
2014 2014-01-07 20 210 43
2014 2014-01-07 20 210 < 20
2014 2014-01-07 20 210 < 20
2014 2014-01-07 20 210 32
2014 2014-01-07 20 210 < 20
2014 2014-01-07 20 210 < 20
2013 2013-07-18 20 210 < 20
2013 2013-07-18 20 210 < 20
2013 2013-07-18 20 210 < 20
2013 2013-07-18 20 210 28
2013 2013-07-18 20 210 < 20
2013 2013-07-18 20 210 < 20
2013 2013-07-18 20 210 37
2013 2013-07-18 20 210 < 20
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2014 2014-01-07 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 0.06 90 < 0.06
2013 2013-07-18 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 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2014 2014-01-07 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
2013 2013-07-18 0.1 0.0103 < 0.1
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2014 2014-01-07 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
2013 2013-07-18 0.08 0 < 0.08
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2014 2014-01-07 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
2013 2013-07-18 0.02 0 < 0.02
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2014 2014-01-07 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
2013 2013-07-18 0.03 0.0004 < 0.03
molybdenum 1 40 1.9875 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 1 40 2.5
2014 2014-01-07 1 40 2.5
2014 2014-01-07 1 40 < 1
2014 2014-01-07 1 40 2.5
2014 2014-01-07 1 40 2.8
2014 2014-01-07 1 40 2.2
2014 2014-01-07 1 40 2.8
2014 2014-01-07 1 40 < 1
2013 2013-08-22 1 40 3
2013 2013-07-18 1 40 3
2013 2013-07-18 1 40 2.8
2013 2013-07-18 1 40 < 1
2013 2013-07-18 1 40 3.1
2013 2013-07-18 1 40 2.5
2013 2013-07-18 1 40 2.1
2013 2013-07-18 1 40 < 1
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2014 2014-01-07 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 0.02 0.07 < 0.02
2013 2013-07-18 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 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2014 2014-01-07 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
2013 2013-07-18 0.03 6.14 < 0.03
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 < 0.03
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2014 2014-01-07 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
2013 2013-07-18 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2014 2014-01-07 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
2013 2013-07-18 0.01 0 < 0.01
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2014 2014-01-07 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
2013 2013-07-18 0.2 140 < 0.2
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2014 2014-01-07 1 70 < 1
2013 2013-08-22 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
2013 2013-07-18 1 70 < 1
chromium 0.2 100 0.4688 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.2 100 0.63
2014 2014-01-07 0.2 100 0.66
2014 2014-01-07 0.2 100 0.64
2014 2014-01-07 0.2 100 0.36
2014 2014-01-07 0.2 100 < 0.2
2014 2014-01-07 0.2 100 < 0.2
2014 2014-01-07 0.2 100 0.61
2014 2014-01-07 0.2 100 0.39
2013 2013-08-22 0.2 100 0.81
2013 2013-07-18 0.2 100 0.9
2013 2013-07-18 0.2 100 < 0.2
2013 2013-07-18 0.2 100 0.49
2013 2013-07-18 0.2 100 0.58
2013 2013-07-18 0.2 100 0.9
2013 2013-07-18 0.2 100 < 0.2
2013 2013-07-18 0.2 100 0.53
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2014 2014-01-07 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
2013 2013-07-18 0.07 0.35 < 0.07
strontium 0.3 1500 75 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.3 1500 29
2014 2014-01-07 0.3 1500 43
2014 2014-01-07 0.3 1500 190
2014 2014-01-07 0.3 1500 53
2014 2014-01-07 0.3 1500 26
2014 2014-01-07 0.3 1500 20
2014 2014-01-07 0.3 1500 39
2014 2014-01-07 0.3 1500 200
2013 2013-08-22 0.3 1500 43
2013 2013-07-18 0.3 1500 61
2013 2013-07-18 0.3 1500 28
2013 2013-07-18 0.3 1500 180
2013 2013-07-18 0.3 1500 38
2013 2013-07-18 0.3 1500 30
2013 2013-07-18 0.3 1500 20
2013 2013-07-18 0.3 1500 200
chromium-6 0.03 0 0.5268 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-01-07 0.03 0 0.83
2014 2014-01-07 0.03 0 0.86
2014 2014-01-07 0.03 0 0.85
2014 2014-01-07 0.03 0 0.41
2014 2014-01-07 0.03 0 0.096
2014 2014-01-07 0.03 0 < 0.03
2014 2014-01-07 0.03 0 0.83
2014 2014-01-07 0.03 0 0.4
2013 2013-07-18 0.03 0 0.89
2013 2013-07-18 0.03 0 0.083
2013 2013-07-18 0.03 0 0.43
2013 2013-07-18 0.03 0 0.62
2013 2013-07-18 0.03 0 0.86
2013 2013-07-18 0.03 0 0.93
2013 2013-07-18 0.03 0 < 0.03
2013 2013-07-18 0.03 0 0.34

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
CA41616 lead 2012-01-01 2014-12-31 0mg/L
491001211229LT3 lead 2011-01-01 2011-12-31 0.0041mg/L
CA36598 lead 2009-01-01 2011-12-31 0.0041mg/L
491001209219L lead 2009-01-01 2009-12-31 0.005mg/L
CA41599 lead 2006-01-01 2008-12-31 0.0034mg/L
491001208198L lead 2008-01-01 2008-12-31 0.0034mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2010-01-01 - 2010-01-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Returned to Compliance
2006-01-01 - 2006-12-31 Nitrates Monitoring, Regular Nitrate Known
2006-04-01 - 2006-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) TTHM Returned to Compliance
2006-04-01 - 2006-06-30 Stage 1 Disinfectants and Disinfection Byproducts Rule Monitoring and Reporting (DBP) Total Haloacetic Acids (HAA5) 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.