Raising awareness about lead and copper

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Centennial Water cares about you, and cares about your water. We pride ourselves in safeguarding our community’s water supply, ensuring when it comes out of your tap you are getting a refreshing, clean glass of water that meets all state and federal regulations.

Lead is not present when water flows from the Joseph B. Blake Water Treatment Plant, nor is it present in the water mains running beneath the streets. There are no lead service lines, goosenecks, or galvanized pipes in our service area. Centennial Water has met lead and copper standards set by the EPA since monitoring began in 1991.

We test lead and copper levels in addition to many other constituents in drinking water according to federal and state laws. The information is reported in our Water Quality Report published annually in late Spring.


What is the Lead and Copper Rule?

In 1991, the Environmental Protection Agency established the Lead and Copper Rule which regulates the amount of lead and copper allowed in water. These contaminants primarily enter drinking water through corrosion of service lines, fixtures or plumbing. Since 1991, Lead and Copper Rule Revisions (LCRR) have been released, updating the latest requirements for lead and copper monitoring, testing and education.


Lead service line inventory

The latest LCRR requires all water providers to conduct a lead service line inventory. Centennial Water does not have any lead service lines in our service area. The oldest homes in our service area were built in 1980. The original system design criteria for Highlands Ranch states that lines 2" and less shall be Type K (soft) copper. All service lines that serve our customers are ¾” K (soft) copper.

There are a few historical buildings that still stand in the community built prior to the development of Highlands Ranch in 1980. This includes the Highlands Ranch Mansion and surrounding ranch properties. For these three unknown service lines, Centennial Water staff identified two of the lines were copper using a visual and scratch test, and the other line as PVC pipe.  Centennial Water staff took pictures of the lines and documented it in the required lead service line inventory. 

To request a copy of our lead service line inventory, or for questions on how we determined we have no lead service lines, contact us via email or call 303-791-0430.


Lead and copper sampling program

The LCRR, and Colorado Department of Public Health and Environment (CDPHE) requires water districts to collect samples from eligible homes to determine lead and copper levels in our water at the tap. Centennial Water’s sampling program is a partnership with homeowners in Highlands Ranch who live in a home built between 1983-1987. The number of homes we are required to sample is dependent upon the population of our service area. With a population of over 103,000 people, we are required to collect 100 samples every six months.

Do you want to participate?

If you live in a single-family home in Highlands Ranch, built between 1983 and 1987, you qualify to participate in the sampling program. Homeowners who participate will be provided with a sample kit along with easy-to-follow instructions. The process is easy.

If you’d like to participate, please complete the contact form below.

Lead and Copper Sampling Program Contact Form


Frequently asked questions

Why is lead a health risk?
Are there lead service lines in Highlands Ranch and/or Solstice?
What are water mains and service lines?
How does lead get into drinking water?
How do I know whether my drinking water contains lead?
How much lead in water is too much?
What can I do to reduce or eliminate lead from my drinking water?
Are there special steps I should take to protect my developing baby, infant or young children?
What does Centennial Water do to protect my household from lead?
Do all home filters and other water treatment devices remove lead?
Is water the only source of lead in homes and businesses?