King County Water District #20 Water System

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: WA5338950
Type: Community water system
EPA Region: 10
Primary Service Area: Residential Area
Primary Source: Surface water purchased
Population Served: 31,910
Contact Information
KING COUNTY WATER DISTRICT #20
Robert Swaab
12606 1st Ave S
Seattle, WA 98168

This public water system services 1 municipality in 1 county.

Summary Results


A summary view of tests in which a water contaminant found to exceed the Maximum Contaminant Level (MCL) set by the EPA.

Maximum Contaminant Levels Exceeded (by year):

Contaminant Detailed Results


This a view of violations of maximum contaminant levels. Use the expanded view see result data for a drinking water contaminant, the minimum level that can be recognized in a test (MRL), and upper limit that is considered healthy (HRL).

HAA5

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0 0.00 17.603
2018 2018-07-09 0 0.00 16.338
2018 2018-07-09 0 0.00 17.243
2018 2018-04-02 0 0.00 24.063
2018 2018-04-02 0 0.00 25.268
2018 2018-04-02 0 0.00 24.992
2018 2018-04-02 0 0.00 17.764
2018 2018-01-08 0 0.00 20.88
2018 2018-01-08 0 0.00 19.8
2018 2018-01-08 0 0.00 23.404
2018 2018-01-08 0 0.00 17.742

HAA6Br

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-04-02 0 0.00 1.429
2018 2018-04-02 0 0.00 1.469
2018 2018-04-02 0 0.00 1.49
2018 2018-04-02 0 0.00 1.047
2018 2018-01-08 0 0.00 1.446
2018 2018-01-08 0 0.00 1.246
2018 2018-01-08 0 0.00 1.387
2018 2018-01-08 0 0.00 1.175

HAA9

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-04-02 0 0.00 25.492
2018 2018-04-02 0 0.00 26.737
2018 2018-04-02 0 0.00 26.482
2018 2018-04-02 0 0.00 18.811
2018 2018-01-08 0 0.00 22.326
2018 2018-01-08 0 0.00 21.046
2018 2018-01-08 0 0.00 24.791
2018 2018-01-08 0 0.00 18.917

alpha-hexachlorocyclohexane

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.01 0.00 < 0.01
2018 2018-04-02 0.01 0.00 < 0.01
2018 2018-01-08 0.01 0.00 < 0.01

butylated hydroxyanisole

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.03 0.00 < 0.03
2018 2018-04-02 0.03 0.00 < 0.03
2018 2018-01-08 0.03 0.00 < 0.03

chlorpyrifos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.03 0.00 < 0.03
2018 2018-04-02 0.03 0.00 < 0.03
2018 2018-01-08 0.03 0.00 < 0.03

dimethipin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.2 0.00 < 0.2
2018 2018-04-02 0.2 0.00 < 0.2
2018 2018-01-08 0.2 0.00 < 0.2

ethoprop

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.03 0.00 < 0.03
2018 2018-04-02 0.03 0.00 < 0.03
2018 2018-01-08 0.03 0.00 < 0.03

germanium

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.3 0.00 < 0.3
2018 2018-04-02 0.3 0.00 < 0.3
2018 2018-01-08 0.3 0.00 < 0.3

manganese

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.4 0.00 1.49
2018 2018-04-02 0.4 0.00 2.163
2018 2018-01-08 0.4 0.00 4.572

o-toluidine

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.007 0.00 < 0.007
2018 2018-04-02 0.007 0.00 < 0.007
2018 2018-01-08 0.007 0.00 < 0.007

oxyfluorfen

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.05 0.00 < 0.05
2018 2018-04-02 0.05 0.00 < 0.05
2018 2018-01-08 0.05 0.00 < 0.05

profenofos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.3 0.00 < 0.3
2018 2018-04-02 0.3 0.00 < 0.3
2018 2018-01-08 0.3 0.00 < 0.3

quinoline

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.02 0.00 < 0.02
2018 2018-04-02 0.02 0.00 < 0.02
2018 2018-01-08 0.02 0.00 < 0.02

tebuconazole

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.2 0.00 < 0.2
2018 2018-04-02 0.2 0.00 < 0.2
2018 2018-01-08 0.2 0.00 < 0.2

total permethrin

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.04 0.00 < 0.04
2018 2018-04-02 0.04 0.00 < 0.04
2018 2018-01-08 0.04 0.00 < 0.04

tribufos

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.07 0.00 < 0.07
2018 2018-04-02 0.07 0.00 < 0.07
2018 2018-01-08 0.07 0.00 < 0.07

1-butanol

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 2 0.00 < 2
2018 2018-04-02 2 0.00 < 2
2018 2018-01-22 2 0.00 < 2

2-methoxyethanol

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.4 0.00 < 0.4
2018 2018-04-02 0.4 0.00 < 0.4
2018 2018-01-22 0.4 0.00 < 0.4

2-propen-1-ol

Year Test Date MRLMinimum Reporting Level HRLHealth Risk Limit Test Result
2018 2018-07-09 0.5 0.00 < 0.5
2018 2018-04-02 0.5 0.00 < 0.5
2018 2018-01-22 0.5 0.00 < 0.5

Other Water Contaminants Tested


The following contaminants were tested and found to be within national EPA guidelines.

Contaminant MRLMinimum Reporting Level HRLHealth Risk Limit Avg Result
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.03 6.14 < 0.03
2014 2014-04-01 0.03 6.14 < 0.03
2014 2014-01-08 0.03 6.14 < 0.03
2013 2013-10-15 0.03 6.14 < 0.03
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.03 0.0004 < 0.03
2014 2014-04-01 0.03 0.0004 < 0.03
2014 2014-01-08 0.03 0.0004 < 0.03
2013 2013-10-15 0.03 0.0004 < 0.03
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.1 0.0103 < 0.1
2014 2014-04-01 0.1 0.0103 < 0.1
2014 2014-01-08 0.1 0.0103 < 0.1
2013 2013-10-15 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
2014 2014-07-09 0.07 0.35 < 0.07
2014 2014-04-01 0.07 0.35 < 0.07
2014 2014-01-08 0.07 0.35 < 0.07
2013 2013-10-15 0.07 0.35 < 0.07
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.2 140 < 0.2
2014 2014-04-01 0.2 140 < 0.2
2014 2014-01-08 0.2 140 < 0.2
2013 2013-10-15 0.2 140 < 0.2
chlorate 20 210 < 20 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 20 210 < 20
2014 2014-07-09 20 210 < 20
2014 2014-04-01 20 210 < 20
2014 2014-04-01 20 210 < 20
2014 2014-01-08 20 210 < 20
2014 2014-01-08 20 210 < 20
2013 2013-10-15 20 210 < 20
2013 2013-10-15 20 210 < 20
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.2 2.69 < 0.2
2014 2014-04-01 0.2 2.69 < 0.2
2014 2014-01-08 0.2 2.69 < 0.2
2013 2013-10-15 0.2 2.69 < 0.2
chromium 0.2 100 0.025 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 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 2014-01-08 0.2 100 < 0.2
2014 2014-01-08 0.2 100 < 0.2
2013 2013-10-15 0.2 100 < 0.2
2013 2013-10-15 0.2 100 0.2
chromium-6 0.03 0 0.1375 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.03 0 0.15
2014 2014-07-09 0.03 0 0.15
2014 2014-04-09 0.03 0 0.11
2014 2014-04-01 0.03 0 0.1
2014 2014-01-08 0.03 0 0.1
2014 2014-01-08 0.03 0 0.13
2013 2013-10-15 0.03 0 0.16
2013 2013-10-15 0.03 0 0.2
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 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 2014-01-08 1 70 < 1
2014 2014-01-08 1 70 < 1
2013 2013-10-15 1 70 < 1
2013 2013-10-15 1 70 < 1
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.06 90 < 0.06
2014 2014-04-01 0.06 90 < 0.06
2014 2014-01-08 0.06 90 < 0.06
2013 2013-10-15 0.06 90 < 0.06
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.08 0 < 0.08
2014 2014-04-01 0.08 0 < 0.08
2014 2014-01-08 0.08 0 < 0.08
2013 2013-10-15 0.08 0 < 0.08
molybdenum 1 40 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 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 2014-01-08 1 40 < 1
2014 2014-01-08 1 40 < 1
2013 2013-10-15 1 40 < 1
2013 2013-10-15 1 40 < 1
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.09 0 < 0.09
2014 2014-04-01 0.09 0 < 0.09
2014 2014-01-08 0.09 0 < 0.09
2013 2013-10-15 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.01 0 < 0.01
2014 2014-04-01 0.01 0 < 0.01
2014 2014-01-08 0.01 0 < 0.01
2013 2013-10-15 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.03 0 < 0.03
2014 2014-04-01 0.03 0 < 0.03
2014 2014-01-08 0.03 0 < 0.03
2013 2013-10-15 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.02 0 < 0.02
2014 2014-04-01 0.02 0 < 0.02
2014 2014-01-08 0.02 0 < 0.02
2013 2013-10-15 0.02 0 < 0.02
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.02 0.07 < 0.02
2014 2014-04-01 0.02 0.07 < 0.02
2014 2014-01-08 0.02 0.07 < 0.02
2013 2013-10-15 0.02 0.07 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.04 0.07 < 0.04
2014 2014-04-01 0.04 0.07 < 0.04
2014 2014-01-08 0.04 0.07 < 0.04
2013 2013-10-15 0.04 0.07 < 0.04
strontium 0.3 1500 28 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.3 1500 28
2014 2014-07-09 0.3 1500 33
2014 2014-04-01 0.3 1500 23
2014 2014-04-01 0.3 1500 25
2014 2014-01-08 0.3 1500 28
2014 2014-01-08 0.3 1500 30
2013 2013-10-15 0.3 1500 28
2013 2013-10-15 0.3 1500 29
vanadium 0.2 21 0.5013 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2014 2014-07-09 0.2 21 0.58
2014 2014-07-09 0.2 21 0.72
2014 2014-04-01 0.2 21 0.38
2014 2014-04-01 0.2 21 0.43
2014 2014-01-08 0.2 21 0.44
2014 2014-01-08 0.2 21 0.49
2013 2013-10-15 0.2 21 0.48
2013 2013-10-15 0.2 21 0.49

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 level. Lead and copper can be — and often are — deposited in drinking water in between the water facility and your tap.

No lead and copper results.

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2003-07-01 - 2003-07-31 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known

Local Water Testing


Find a lab in your area so you can get your tap or well water tested. This list contains both governmental and private labs, all of which are EPA-certified for drinking water testing.

Lab Location Zip Code
Lab/Cor, Inc. Seattle, WA 98117
EDGE ANALYTICAL, INC. BURLINGTON, WA 98233
LABCOR INC SEATTLE, WA 98117

Water Bill Information


Convenient information about your water service.

Unable to identify any billing information about King County Water District #20 (WA5338950).

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.