Reverse Osmosis Drinking Water Systems in Highlands Ranch, CO

A quick note before anything else: Highlands Ranch Water's supply meets or exceeds every EPA and Colorado Department of Public Health & Environment drinking water standard. Nothing on this page is about fixing an unsafe water supply, because that isn't the situation Highlands Ranch is in. Reverse osmosis (RO) is something homeowners choose for taste, clarity, and the kind of water quality that's genuinely noticeable in a cup of coffee, a glass poured straight from the tap, or ice that doesn't cloud — not because the water coming out of the wall is a health concern.

That distinction matters because it shapes what RO is actually for in a Highlands Ranch home: it's the most thorough filtration step available at the point of use, layered on top of — not instead of — whatever whole-house filtration and softening you already have.

How reverse osmosis works

RO systems push water through a semi-permeable membrane with pores small enough to block dissolved solids, most of what's left of the chlorine taste after whole-house filtration, and a wide range of other dissolved compounds, while letting water molecules through. What comes out the other side is water stripped down close to its molecular baseline — which is why RO water reads as noticeably "cleaner" and flatter in taste tests compared with straight tap water, even water that's already been through carbon filtration upstream.

A standard residential RO system is built in stages, typically four to six depending on the model:

1. Sediment pre-filter — removes particulate before it reaches the membrane, protecting it from premature fouling.
2. Carbon pre-filter — reduces chlorine and organic taste/odor compounds ahead of the membrane, since chlorine can degrade certain membrane materials over time.
3. RO membrane — the core stage, rejecting the majority of dissolved solids and passing purified water through to a storage tank.
4. Storage tank — holds finished water under pressure so it's available on demand at the faucet rather than needing to be filtered in real time.
5. Carbon polishing filter — a final taste stage the water passes through right before it reaches the faucet, removing any taste picked up from the storage tank.
6. Remineralization (optional add-on) — some systems add a stage that reintroduces a small amount of beneficial mineral content purely for taste preference, since RO water without it can taste slightly flat to some palates.

Tank-style vs. tankless RO

What RO does that whole-house filtration doesn't

Our whole-house filtration page covers sediment and carbon filtration for the entire home — every fixture, from showers to the washing machine. RO is a different tier of treatment applied to a single tap (or, in kitchens with a dedicated fridge/ice-maker line, two). It reduces total dissolved solids far more aggressively than carbon filtration alone, which is why RO water is the standard choice for:

• Coffee and espresso. High mineral content changes extraction and can leave scale inside espresso machines; lower-TDS water is the standard recommendation from most premium espresso machine manufacturers.
• Ice makers. Lower dissolved solids produce clearer, better-tasting ice with less mineral buildup inside the ice maker mechanism itself.
• Drinking water taste. The most noticeable, immediate difference homeowners report after installing RO.
• Infant formula and cooking water where families prefer the most neutral-tasting water available, independent of any safety consideration.

Installation

A standard under-sink RO install in a Highlands Ranch kitchen typically takes two to four hours and includes:

• Under-sink mounting. The filtration stages and storage tank are mounted inside the cabinet, tucked to leave working space for household storage.
• Cold water line tap-in. A dedicated feed line taps into the cold water supply beneath the sink.
• Drain line connection. RO systems produce a small amount of concentrate/reject water during filtration, which is routed to the drain via a saddle valve.
• Dedicated faucet. A separate small faucet is installed at the sink deck or countertop specifically for RO water, keeping it separate from the regular tap.
• Optional refrigerator/ice-maker tie-in. For kitchens with a built-in ice maker or water dispenser, a secondary line can be run from the RO system to the refrigerator.

Cost and efficiency

Older RO systems were known for wasting several gallons of water for every gallon of purified water produced. Modern systems with efficient membranes and permeate pumps have narrowed that ratio considerably, and it's worth asking any installer directly about a given system's waste ratio if water efficiency matters to you.

Maintenance schedule

Most systems include a simple filter-change reminder or indicator light, and swapping cartridges is a straightforward homeowner task once shown — the membrane itself is the one component most homeowners have a local specialist handle, since it requires flushing and testing to confirm proper rejection rates afterward.

Why RO and a softener work well together

It's worth understanding the connection between the two systems, even though they're separate purchases. Feeding an RO system water that's already been softened extends the membrane's working life, because the same calcium and magnesium that scale a water heater can also foul an RO membrane over time, gradually reducing its rejection rate and flow. Homes running RO off unsoftened 11–13 grain water tend to see membrane replacement intervals shorten compared with homes feeding the RO system softened water first. It's not a requirement — RO systems are designed to handle hard water feed — but it's a meaningful factor in total cost of ownership over several years, and one most installers will walk through when scoping a system for your kitchen.

Signs your kitchen would benefit from RO

Frequently asked questions