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Tap water quality report

Maplewood Addition Water Coop

EPA monitoring tested this supplier for 56 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

56
contaminants tested
8
detected
435
people served
1
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Private
Counties served
King

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

1
health-based violations
78
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1994-02-01 → 1994-02-28
Other Monitoring Resolved 2021-07-01
Other Monitoring Resolved 2019-07-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2016-07-01
Other Monitoring Resolved 2015-07-01
MR Monitoring Resolved 2015-04-01 → 2015-04-30
MR Monitoring Resolved 2015-01-01
MR Monitoring Resolved 2015-01-01 → 2015-12-31
Other Monitoring Resolved 2013-07-01

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.00060 mg/L 4%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2024
TTHM
0.4100 µg/L 0.5%
of the EPA limit 80 µg/L
 2/3 SYR4 2012–2017
Copper
33 µg/L 2.5%
of the EPA limit 1300 µg/L
 1/1 SYR4 2018
Chloroform
0.4100 µg/L
No EPA limit set
 1/5 SYR4 2012–2017
Dibromoacetic Acid
0.7700 µg/L
No EPA limit set
 1/3 SYR4 2012–2017
Dibromochloromethane
0.3500 µg/L
No EPA limit set
 1/5 SYR4 2012–2017
Total Haloacetic Acids (HAA5)
1.37 µg/L 2.3%
of the EPA limit 60 µg/L
 1/3 SYR4 2012–2017
Trichloroacetic Acid
0.6000 µg/L
No EPA limit set
 1/3 SYR4 2012–2017
48 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDichloroacetic AcidDinosebEthylbenzeneFluorideLeadMercuryMonobromoacetic AcidMonochloroacetic AcidNitrateNitrate-NitriteNitritePentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Chase OBrien

Frequently asked questions about Maplewood Addition Water Coop

Is Maplewood Addition Water Coop tap water safe to drink?

EPA monitoring detected 8 contaminants in Maplewood Addition Water Coop's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Maplewood Addition Water Coop's water?

EPA monitoring detected Lead, TTHM, Copper, Chloroform, Dibromoacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Maplewood Addition Water Coop serve?

Maplewood Addition Water Coop reports serving 435 people in Washington, per its EPA record.

Has Maplewood Addition Water Coop had any water quality violations?

The EPA has 78 violations on file for Maplewood Addition Water Coop, of which 1 is health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.