Gwinnett Water Resources provides high-quality drinking water to Gwinnett County residents. Water taken from Lake Lanier is processed by one of our two water production facilities, Shoal Creek Filter Plant or Lanier Filter Plant. After the filtration process, the water enters our distribution system of underground piping and storage tanks. Staff at all facilities continuously monitor and analyze water quality to ensure drinking water meets or exceeds all federal and state regulations for safety, based on the Safe Drinking Water Act and the Clean Water Act. Simply put, our water is safe to drink.

Water Quality at Home
The water produced in Gwinnett County is safe to drink directly from the tap and does not require boiling or filtering beforehand. Most issues with tap water originate in home plumbing systems. For example, black specks in the water are usually a sign of degrading internal plumbing. You can visit Resident Resources for information about what your responsibilities are as a homeowner.

Every year, we publish the annual Water Quality Report containing important information about the quality of your drinking water. Gwinnett County’s water is tested for various organic and inorganic substances in strict adherence with state and federal regulations. In 2023, there were no EPA Safe Drinking Water Act violations to report.

• 2023 Water Quality Report
• 2023 Water Quality Report - Spanish

Parameter	Defined	Minimum Concentration Detected	Maximum Concentration Detected	Average Concentration
pH (SU)	Acidity level	6.78	8.51	7.26
Total Alkalinity (as CaCO3)	A measurement of dissolved alkaline substances in water that can neutralize acid. dkh = a unit of water hardness, derived from the German Karbonathärte	0.89 dkh (16 mg/L)	1.45 dkh (26 mg/L)	1.12 dkh (20 mg/L)
Bicarbonate Alkalinity (as HCO3)	A measurement of bicarbonate substances in water that can neutralize acid.	19.5 mg/L	31.7 mg/L	24.4 mg/L
Total Hardness (grains per gallon)	A measurement of how much calcium and magnesium are in the water.	1.05 grains per gallon	1.87 grains per gallon	1.34 grains per gallon
Calcium	Calcium is an element that is essential to life; it gets into the water through contact with rocks and soil.	4.8 mg/L	9.6 mg/L	6.8 mg/L
Magnesium	Magnesium is an element that is essential to life; it gets into the water through contact with rocks and soil.	1.4 mg/L	1.9 mg/L	1.5 mg/L
Sodium	Sodium is an element that is essential to life; it gets into the water through contact with rocks and soil.	5.8 mg/L	6.0 mg/L	5.9 mg/L
Chloride	Chloride is an important naturally occurring element; it gets into the water through salt deposits that the water comes in contact with and through water treatment.	7.15 mg/L	9.55 mg/L	8.00 mg/L
Sulfate	Sulfate is a naturally occurring chemical that enters the water naturally as well as from human activities such as fertilization or industrial activities.	3.04 mg/L	4.82 mg/L	3.79 mg/L

Both of Gwinnett’s award-winning water filter plants, Lanier and Shoal Creek, pull water from Lake Lanier. Combined, these two plants can treat and distribute more than 25 billion gallons of clean water each year, providing drinking water and fire service for more than one million residents. Both filter plants protect public health and safety by using state-of-the-art treatment processes and monitoring water quality around the clock.
 
Gwinnett’s water quality goals are higher than those required by state and federal regulations, and our water is consistently compliant with the Safe Drinking Water Act.
 
Visit Water Outages  for information about planned and unplanned water outages.
Visit Construction to learn more about our current efforts to update and maintain our water, stormwater, and sewer systems.