Water Testing

The LMLPA works with Alabama Water Watch to  actively monitor Logan Martin Lake and keep a close record of lake conditions.

Where we test:

For an interactive Google Map, Click here or on the Map Above.

Interested in becoming a water tester? Click here for info on certification workshops.

What we measure

pH: The pH is a measure of the level of acidity or alkalinity of water or another solution. The optimal pH range for aquatic life is 6.5 to 8.5 or 9.0. pH less than 4.0 or more than 11.0 is usually lethal to fish and other organisms.
more information on pH
pH regulations in Alabama
Downloadable PDF

Water Temperature: Temperature affects how much oxygen water can hold and how quickly nutrients will cycle through the aquatic system. Most aquatic organisms can tolerate gradual changes in temperature, but drastic changes can cause thermal stress.  Temperatures above 32 °C may be lethal to many aquatic organisms.  Some Antarctic fish die at temperatures above 4 °C.
water temperature regulations in Alabama
more information on temperature
Downloadable PDF

Alkalinity: Alkalinity is a measure of the buffering capacity of water. Higher alkalinity in a body of water provides a “buffer” against changes in pH, making it more stable for aquatic life. Limestone is a natural source of alkalinity.  The chemical name of limestone is calcium carbonate (CaCO3) or magnesium carbonate (MgCO3). Alkalinity values across Alabama range from 10 mg/L or less in parts of the Coastal Plain to 200 mg/L and more in regions with limestone formations and outcrops, such as in the Upper Coosa River Basin, the Black Belt and the Interior Plateau (Limestone County area).
more information on alkalinity
Downloadable PDF

Hardness: Hardness in water is primarily a measure of the amount of dissolved calcium and magnesium. Limestone is a natural source of hardness. Most fish and aquatic organisms live in waters with hardness between 15 and 200 mg/L.  In waterbodies with hardness less than 15 mg/L or greater than 500 mg/L fish reproduction may be limited.  Drinking water with hardness greater than 350 mg/L can be harmful to humans.
more information  on hardness
Downloadable PDF

Dissolved Oxygen: Like land organisms, aquatic animals and plants need oxygen to live. Oxygen enters water in two ways: Physically, when air mixes with water; this is usually the primary source of dissolved oxygen  in streams, and biologically, when aquatic plants release oxygen during photosynthesis; this is usually the primary source of dissolved oxygen in lakes and oceans.
more information on dissolved oxygen
Downloadable PDF

Turbidity: Turbidity is a measurement of water cloudiness caused by suspended matter. High turbidity limits sunlight penetration in water, inhibits growth of aquatic plants, and can upset aquatic ecosystems. High clay turbidity is an indication of soil erosion which leads to sedimentation of streams, rivers, lakes and reservoirs.  This is Alabama’s number one water pollution problem!
more information on turbidity
Downloadable PDF

Water Clarity: In lakes, ponds and estuaries, the Secchi disk is used to measure water clarity. The Secchi disk is a 20-centimeter (8 inch) diameter disk with black and white quadrants and an attached line marked in pre-measured increments of meters and half-meters. Secchi disk depth is the distance (in meters) from the surface of the water to the greatest depth at which the disk is still visible.