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 amount of fecal coliform present in the water.  

For questions or concerns regarding the water quality at Lake Tye, please contact the City Stormwater Compliance Coordinator at vbertrand@monroewa.gov or 360-794-6100.

Lake Tye

WATER QUALITY TEST RESULTS

Fecal Coliform bacteria are typically present in lake waters, and they are used as a key indicator to determine if a higher probability of water contaminated with fecal material from humans, birds, or other animals represents a public health concern.  Although fecal coliform bacteria are present in lakes and streams, when they are present at elevated levels above 1000 CFU/100ml, it typically indicates that other disease-causing bacteria are present as well.  Should levels in Lake Tye exceed 1000CFU/100ml, then the City will post public notification to take necessary precautions when recreating in and around the lake. 

MONTH/YR. JAN
2019
FEB
2019
MARCH
2019
APRIL
2019
MAY
2019
JUNE
2019
JULY
2019
AUG
2019
SEPT
2019
OCT
2019
NOV
2018
DEC
2018

FECAL COLIFORM BACTERIA - CFU/100ML

128 133 134 2 6 17 10 9 8 7 115 128
FIVE YEAR AVG.  FECAL COLIFORM BACTERIA - CFU/100ML 
59.2

Lake Temperature is measured to predict the general health of the biological activity in the lake.  If temperatures are too high, or too 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 
2019
FEB 
2019
MARCH
2019
APRIL
2019
MAY
2019
JUNE
2019
JULY
2019
AUG.
2019
SEPT.
2019
OCT.
2019
NOV.
2018
DEC.
2018

TEMPERATURE - F

44.7 42.4 41.9 53.6 65.1 67.6 69.4 75.3 69.6 58.6 51.0 45.3

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

MONTH/YR. JAN
2019
FEB
2019
MARCH
2019
APRIL
2019
MAY
2019
JUNE 
2019
JULY
2019
AUG
2019
SEPT
2019
OCT
2019
NOV
2018
DEC
2018
DISSOLVED OXYGEN - MG/L 11.2 13.8 14.3 12.7 10.8 10.6 9.8 9.4 8.3 7.9 7.4 8.6

Blue-Green Algae is a potentially toxic type of bacteria (cyanobacteria) which is found in many of the lakes in Snohomish County.  Blue-green "blooms" are most commonly present when water temperatures are warmest in the summer months.  Protecting pets and small children 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 at 360-794-6100 so that an assessment and testing of the algae can be completed as may be necessary.