Drinking Water
Safe and Reliable
We want to assure you that Longmont’s drinking water is safe for you to use and that the water treatment and delivery system is sound. This ensures you have a continuous and uninterrupted supply of drinking water every day.
Here are a few other things you should know:
- Our drinking water supply comes from clean and natural sources in the Rockies making it easy to treat, creating safe drinking water.
- We are constantly treating your drinking water through advanced treatment processes and testing it to make sure it’s safe. View our most recent annual Water Quality Report below. You can also visit our Lead Protection for Longmont Water webpage to understand how the City is ensuring lead protection.
- We have excellent plans and well-trained staff that make us resilient to unexpected events like floods, epic snow storms, power outages and public health events.
We are always committed to providing safe and reliable drinking water for our community. Always.
Annual Drinking Water Quality Report
The City of Longmont annual Drinking Water Quality Report provides information about Longmont's drinking water and the results of thousands of tests performed on the water throughout the year. We hope this report answers any questions you may have about your drinking water.
Download the Water Quality Report (PDF)
Still have questions or concerns? Contact Water.
Para solicitar el informe anual de calidad del agua potable de Longmont en Español, marque 303-651-8416.
2023 Longmont Drinking Wate... by City of Longmont, Colorado
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Drinking Water Treatment
Follow the steps our drinking water goes through on its way to you.
Backflow Prevention
Learn how the City's Backflow Prevention and Cross-Connection Control Program (BPCCP) is designed to protect and preserve the City’s potable water supply from pollutants and contaminants.
Backflow & Cross Connection Information
You can help keep our water system safe by installing, maintaining and testing your backflow prevention assemblies within the timeframe designated by the City.
Water Line Flushing
Each spring, the City of Longmont water staff flushes the main water lines to keep water quality at its highest level and to ensure that fire hydrants are operational.
Water Line Replacement
With more than 450 miles of water line delivering more than 5 billion gallons of high quality water to customers each year, it is critical that Longmont takes care of its water lines to provide a reliable and efficient service.
Water Meter Maintenance Program
The City conducts an annual maintenance program to replace water meters on a scheduled cycle to ensure measuring accuracy, which makes sure that each water customer receives an accurate bill and pays the appropriate amount for water consumption.
Fluoride Supply Status
Is Longmont currently supplying fluoride to its drinking water? The answer is Yes.
Background
Since the 1950s, fluoride has been regularly added to drinking water supplies in the U.S. to prevent tooth decay and reduce the risk of oral disease. Over 74% of the U.S. population on community water systems receives fluoridated drinking water, according to the Centers for Disease Control (CDC). Longmont has been fluoridating its water supply since 1958.
The U.S. Public Health Service currently recommends a fluoride level of 0.7 mg/L in drinking water.
Longmont’s water has a naturally occurring level of about 0.2 mg/L, so a small amount of sodium silicofluoride (SSF) must be added to the water supply to reach the recommend dosage level.
The Situation
The production and supply chain for sodium silicofluoride (SSF) has changed in recent years leading to delayed delivery cycles and periodic shortages. These recent market changes may occasionally disrupt Longmont’s ability to continuously add SSF to the water supply.
The benefits of fluoridated water come from drinking water over long periods of time. Short-term interruptions (a few days or weeks) will have minimal to no impact on the oral health benefits of Longmont’s water.
Longmont does not have any plans to permanently discontinue fluoridation of its drinking water. Fluoridation will only be discontinued when there are short-term supply disruptions. Longmont City Council has requested that staff use the City’s website to inform residents of the status of Longmont’s fluoridation practice.
