Service area · Highlands Ranch / South Denver Metro

Water treatment in Highlands Ranch

Roughly 105,000 people live in this master-planned Douglas County community between C-470 and the Palmer Divide, and nearly every address runs on the same utility — so water treatment in Highlands Ranch comes down to one supply, one set of byproducts, and the plumbing inside your particular home. Centennial Water draws treated surface water from McLellan, the South Platte River, and Chatfield and pushes it through a distribution system with no lead service lines. A small share of acreage homes at the edges still pull from private wells.

Get a quote Call (303) 248-3390

Centennial WaterTreated surface supply — no lead service lines
Hard + ChlorineModerately hard water plus disinfection byproducts

Highlands Ranch spigot drawing treated Centennial Water

Centennial Water and the planned-community supply

What the Centennial Water distribution main delivers — and what your home's plumbing adds

The Centennial Water and Sanitation District supplies the community, drawing treated surface water from McLellan Reservoir, the South Platte River, and Chatfield Reservoir and pushing it through a distribution system with no lead service lines. A very small share of homes on the acreage at the outer edges still draw from private wells tapping the local alluvial aquifer.

Centennial Water publishes a detailed water-quality report each spring — disinfection byproducts from the chlorine residual, plus arsenic, radium, and uranium at trace levels. The EPA caps HAA5 at 0.060 mg/L and total trihalomethanes at 0.080 mg/L, and Centennial Water reports both. Because the distribution system has no lead service lines, the lead and copper that turn up at the tap come from household plumbing in the older neighborhoods: Eastridge has homes built before 1986, Timberline Ridge has older copper and galvanized-steel plumbing, and Northridge was built out across the 1980s and 1990s. At the community's edges, acreage homes on private wells shift toward iron and manganese staining, arsenic and nitrates, and the occasional radionuclide or VOC near older septic systems.

Treated surface water from McLellan, South Platte, and Chatfield Reservoir
No lead service lines in the distribution system
Haloacetic acids and trihalomethanes from the chlorine residual
Lead and copper from pre-1986 plumbing, solder, and brass fixtures
Arsenic, radium, and uranium at trace levels in district testing
Iron, manganese, and arsenic on private wells at the edges

Water softener and whole-home treatment system installed in a Highlands Ranch home

Highlands Ranch treatment, matched to the address

Softeners, RO, and whole-house filtration for Highlands Ranch's consistent housing stock

Because Highlands Ranch is a planned community, the housing stock is more consistent than in older metro suburbs — but that cuts two ways. There are no lead service lines, so the metals at the tap come from household plumbing, not the main. The catch is that pre-1986 neighborhoods like Eastridge, Timberline Ridge, and Northridge all share similar copper and galvanized plumbing with lead solder and brass fixtures, so the lead-and-copper story repeats address to address. Because water treatment in Highlands Ranch targets that repeatable plumbing story, a water softener at the point of entry handles the hardness and protects appliances, and an under-sink RO unit with a carbon stage pulls the trace metals, disinfection byproducts, and any residual radium or uranium down to drinking-water levels at the drinking tap.

Older homes with lead-solder or brass-fixture concerns often add a point-of-use lead-certified filter at the kitchen tap until the plumbing can be replaced. A whole house water filter catches the particulate and chlorine side at entry, and salt-free water conditioners suit homeowners who want scale control without sodium exchange. For acreage homes on private wells at the edges, well water treatment shifts again: a larger softener, greensand for iron and manganese, anion-exchange for arsenic, UV for coliform on shallow completions, and reverse osmosis at the kitchen tap for nitrates and VOCs. We install, verify at every tap, and return annually — including water filtration maintenance and PFAS removal consultations.

No-cost on-site water testing
Water softeners sized to Centennial Water hardness
Reverse osmosis for the drinking-water tap
Whole house filters for chlorine and byproducts
Salt-free water conditioners for scale control without sodium
Under-sink filters and lead-certified point-of-use for pre-1986 homes
Iron and manganese filtration for private wells

Water Works service truck running south-metro routes to Highlands Ranch

South-metro routes out of the Denver office

Dispatching techs to Highlands Ranch along C-470 and I-25

Highlands Ranch sits between C-470 and the Palmer Divide, inside the C-470 belt but south of the central Denver core — close enough to the Denver Metro office that a run out to a Highlands Ranch address is a routine day. Our techs leave Denver, run south on I-25 or out C-470, and arrive as a normal scheduled stop. That matters because the acreage-edge homes on private wells have nobody else testing them.

Coverage runs the C-470 and I-25 corridors through Douglas County — Littleton to the northwest, Centennial to the north, Castle Rock and Parker to the south, and Denver proper to the north. The neighborhoods inside Highlands Ranch range from older pockets like Eastridge with pre-1986 plumbing to newer subdivisions built out over the last two decades, so our techs size softeners, pre-filters, and RO units to the actual water reading at the address. The right water treatment in Highlands Ranch accounts for both the municipal supply and the private-well edges. The EPA set enforceable limits of 4.0 ppt for PFOA and PFOS in April 2024, and Colorado has documented contamination in areas with industrial or firefighting-foam history. We keep every install on an annual testing cycle so we catch a trend before it reaches your tap.

Denver Metro office — C-470 and I-25 through Douglas County
Scheduled routes to Littleton, Centennial, Castle Rock, Parker, and Denver
On-site testing, softener installs, and RO work on municipal homes
Well testing and iron-and-manganese filtration on acreage homes
Statewide dispatch outside the metro corridor

Highlands Ranch water — what residents ask us

Is Highlands Ranch's tap water safe to drink?

For most of Highlands Ranch the tap water is municipal, tested, and treated — but that is not the same as being right for your specific house. The Centennial Water and Sanitation District runs water-quality monitoring across the development and delivers treated surface water through the community's distribution system. There are no lead service lines, so the lead and copper at the tap come almost entirely from household plumbing — solder and brass fixtures in homes built before the 1986 lead ban. An on-site test at your address is the only way to know what your tap delivers.

What contaminants are most common in Highlands Ranch water?

Centennial Water reports on haloacetic acids, total trihalomethanes, bromodichloromethane, dibromochloromethane, and dibromoacetic acid — disinfection byproducts from the chlorine residual — plus arsenic, radium, and uranium at trace levels. Above all of that sits hardness: the treated surface supply delivers a meaningful calcium and magnesium load by the time it reaches your faucet. Lead and copper come from older plumbing in Eastridge (pre-1986) and Timberline Ridge (copper and galvanized steel), not the source water. On the acreage at the edges where private wells sit, the profile shifts toward iron and manganese staining, arsenic and nitrates, and the occasional radionuclide or VOC near older septic systems.

How often should I test my water in Highlands Ranch?

For homes on the Centennial Water system, test at least once a year for hardness, chlorine residual, pH, total dissolved solids, and lead and copper — especially in Eastridge, Timberline Ridge, or Northridge where pre-1986 plumbing is common. For a private well at the acreage edge, test annually for coliform bacteria, nitrates, and arsenic. Test again after a major storm or snowmelt pulse that shifts TDS, after changes in nearby land use, and after any work on the well, pump, plumbing, or fixtures.

Do Highlands Ranch homes really need a water softener?

Almost always, yes. The treated Centennial Water supply measures about 96.0 mg/L (5.6 gpg) — moderately hard on the USGS scale — and inside many homes the working hardness climbs above that because of mineral pickup in older copper service lines and long plumbing runs. You will see the mineral load as spotting on glassware, scale on faucets and tile, and shortened lifespans for water heaters, dishwashers, washing machines, and ice makers. A properly sized ion-exchange softener removes the calcium and magnesium that drive that damage. Salt-free conditioners help with scale but do not pull the hardness minerals out.

Can you service my home outside of Highlands Ranch?

Yes. Our Denver Metro office at (303) 248-3390 covers Highlands Ranch and the surrounding south-metro communities along the C-470 and I-25 corridors — Littleton, Centennial, Castle Rock, Parker, and Denver — with scheduled routes year-round. On-site testing, softener and RO installs, and iron-and-manganese filtration on the acreage homes at the edges are routine work. Statewide dispatch out of our four regional offices covers the rest of Colorado.

No-cost water testing in Highlands Ranch — book your visit

See what your Highlands Ranch tap carries — Centennial Water inside the development, a private well on acreage at the edge, or an older home in Eastridge, Timberline Ridge, or Northridge with pre-1986 plumbing. We test on-site, walk you through the results, and design a treatment system around your source. Schedule with our Denver Metro office at (303) 248-3390 for coverage across Highlands Ranch and the C-470 / I-25 south-metro suburbs, with statewide dispatch for anything further out.

Get a quote