Lake Tye Water Quality Testing

Lake Tye is a popular recreational lake located at the western edge of Monroe.  Throughout the year residents and visitors spend time at the lake swimming, paddling, fishing, and enjoying the surrounding park area.  

As required by the Washington State Department of Ecology, the City collects routine lake water samples to measure lake temperature, dissolved oxygen levels, and the current level of fecal coliform present in the water.  

For questions or concerns regarding the water quality at Lake Tye, please visit Monroe Listens or 360-794-7400 during normal business hours.

Lake Tye Swimmers

WATER QUALITY TEST RESULTS

Fecal coliform bacteria are typically present in lake waters. They are used as a key indicator to determine the health risk of water contaminated with fecal material and if there is a public health concern. Although fecal coliform bacteria are ever present in lakes and streams, elevated levels above 1000 CFU/100ml, typically indicates that other disease-causing bacteria may be present. Should levels in Lake Tye exceed 1000CFU/100ml, the City will notify the public.

MONTH/YR. JAN
2020
FEB
2020
MAR
2020
APR
2020
MAY
2020
JUNE
2020
JULY
2020
AUG
2020
SEPT
2020
OCT
2020
NOV
2019
DEC
2019

FECAL COLIFORM BACTERIA - CFU/100ML

  41   27    0 1 7 3 1 3    2    13    8     1
FIVE YEAR AVG.  FECAL COLIFORM BACTERIA - CFU/100ML 
59.2

Lake Temperature is measured to predict the general health of the biological activity within the lake. If temperatures are exceedingly high, or low, fish, insects, zooplankton, phytoplankton and other aquatic species may be affected. As is to be expected, lake temperatures typically increase as the weather warms in the summer, and decrease as the weather cools in the winter.

MONTH/YR. JAN 
2020
FEB 
2020
MAR
2020
APR
2020
MAY
2020
JUNE
2020
JULY
2020
AUG.
2020
SEPT.
2020
OCT.
2020
NOV.
2019
DEC.
2019

TEMPERATURE - F

46.4 44.1 46.4 58.8 60 66.9 72.8 75.7 70.8 60.8 50.7 46.4

Dissolved Oxygen is an important measure of water quality for aquatic life. When dissolved oxygen levels become low (less than 5 mg/l) aquatic life may suffer. Factors that may affect the level of dissolved oxygen in the lake include atmospheric pressure, water temperature, aquatic plant life cycle, ground water levels, and pollution in the water. For these reasons, it is normal for dissolved oxygen to fluctuate seasonally.

MONTH/YR. JAN
2020
FEB
2020
MAR
2020
APR
2020
MAY
2020
JUNE 
2020
JULY
2020
AUG
2020
SEPT
2020
OCT 
2020
NOV
2019
DEC
2019
DISSOLVED OXYGEN - MG/L 9.6 10.5 12.7 12.1 11.1 10.5 10.2 9.7 9.7 7.1 7.3 8.04

Blue-Green Algae is a potentially toxic type of bacteria (cyanobacteria) which is found in many of Snohomish County's lakes. Blue-green "blooms" are most commonly present when water temperatures are warmest in the summer months. Protecting humans and pets by eliminating contact with and ingestion of blue-green tainted water is advisable.  If you become aware of a possible bloom, please report it to City staff so that an assessment and testing of the algae can be completed as necessary.