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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
Below health limit
Exceeded health limit
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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
[+] Expand Test Data
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.
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.