Is reverse osmosis worth it? Refill vs. home system vs. bottled

What RO water costs, three ways

We priced the same gallon three ways: at a refill station, from a home system and in a store-bought bottle. Home system and bottled prices are list prices we saw on the seller's own page on October 24, 2026. Refill prices are the listed prices in our directory on the same day.

The home system rows count the system plus the replacement filters each maker lists, and nothing else: no installation, shipping, tax or electricity, and no value put on the water it sends down the drain. The bottled rows use list prices for Great Value Purified (40 bottles of 16.9 ounces for $5.97, about $1.13 a gallon), the Great Value 1-gallon jug ($1.47) and Good & Gather Purified at Target ($1.49 a gallon). Walmart prices can vary by store.

For the full 5-gallon jug math, see refilling vs. bottled water: the real cost.

Refill-station RO: $0.50 a gallon at most stations

More than 21,000 stations in our directory list reverse osmosis water, and more than 18,000 of them have a listed price. Most list $0.50 a gallon, so a 5-gallon jug comes to about $2.50. The full range we see is $0.20 to $1.00 a gallon, and nearly all of it falls between $0.50 and $0.70.

Most of those listings are self-serve machines in stores you already visit, many of them Primo machines at Walmart, grocery stores and CVS. Here's where to refill a 5-gallon jug, store by store.

What you give up is control. Refill machines commonly use RO and change filters on the operator's schedule, not yours. A 2026 study of US refill kiosks also found that what happens after the membrane matters, which we cover in does RO remove PFAS, fluoride and microplastics? Before you fill, give the machine a quick look with our refill station checklist.

Home RO: what a system really costs

The sticker price is only the start. Here's what two systems cost, using the makers' own list prices and filter schedules on October 24, 2026.

Budget under-sink system with a tank. The APEC Essence ROES-50 lists at $230.99. APEC says to change the first three filters every 6 to 12 months and the membrane and final filter every 2 to 4 years, depending on your water and how much you use (APEC FAQ). Its pre-filter set lists at $29.95 and its complete 5-stage set at $79.99. Over 5 years, that's about $401 to $601 for the system and filters together.

Tankless system with a pump. The iSpring RO5004F lists at $329.99. Its 1-year filter pack lists at $109.99 and lasts "up to a full year", and its membrane lists at $93.99 and lasts "up to 24 months". Over 5 years, that's about $958 at the longest filter life, and more if your water wears filters out sooner.

Three more costs don't show up on the price tag:

1. 1Water down the drain. RO sends part of the water it treats down the drain. A typical point-of-use system makes five gallons or more of reject water for every gallon you drink, and some inefficient units make up to 10, according to the EPA. Systems with the EPA's WaterSense label send 2.3 gallons or less. At a gallon a day on a typical system, that's more than 1,800 gallons a year to the drain.
2. 2Installation. APEC says its systems are made for do-it-yourself installs and that most of its customers put them in without help. If you'd rather not, a plumber is an added cost. Renters usually need the landlord's okay.
3. 3Your time. Filters only work if you change them. Put the dates on your calendar the day you install.

When home RO pays off

It comes down to how much you drink at home. Here's when each system's total cost drops below buying the same water at $0.50 a gallon from a refill station:

So home RO is worth it if:

• your household drinks a gallon or more a day at home,
• you own your place, or your landlord says yes,
• you'll change filters on schedule, and
• you're fine with the water that goes down the drain.

If you drink less, rent, move often, or don't want a filter schedule, a refill station gets you RO water for less with no setup. You can also do both: a home system for the kitchen and a refill station for the cabin, the office or the road.

Bottled water: the priciest way to get it

A lot of bottled water is already made with RO. Water labeled "purified" has to be made by distillation, deionization, reverse osmosis or another suitable process, under FDA rules for bottled water. So with purified bottled water, you're often paying two to three times the refill price for a similar treatment process, plus the plastic. If plastic is part of why you're reading this, see what we know about microplastics in bottled water.

Bottled water still makes sense when a refill station isn't an option:

• Emergencies. Ready.gov says to store at least one gallon per person per day for several days, and to keep commercially bottled water sealed in its original container.
• Boil-water notices. Follow your water utility's instructions until the notice is lifted.
• Trips and days away from home, when a sealed bottle is the easy option.

Carrying refill water home

If you refill, you'll need jugs. Common choices are polycarbonate (resin code 7), BPA-free plastic and glass. FDA says its review "has not found any information" to change its safety assessment of BPA in food packaging. If you'd still rather skip it, BPA-free and glass jugs are easy to find. Whatever you use, keep it clean: here's how to clean and store your jugs.

FAQ

What is the cheapest way to get reverse osmosis water?

For most people, a refill station. Most RO listings in our directory post $0.50 a gallon, with no system to buy. If your household drinks a gallon or more a day at home, a budget under-sink system can cost less after about 1.5 to 2 years.

Can I buy reverse osmosis water at the store?

Yes, two ways. Many grocery stores, Walmarts and some CVS stores have self-serve RO refill machines, and bottled water labeled "purified" is often made with RO. The refill machine is usually much cheaper per gallon.

How much does a reverse osmosis system cost?

The two under-sink systems we priced listed at $230.99 and $329.99 on October 24, 2026. With replacement filters, they came to about $401 to $958 over 5 years, before installation.

Do I need a plumber to install a reverse osmosis system?

Not always. APEC, for one, sells its systems as do-it-yourself installs. If you're not comfortable working under the sink, a plumber can do it for an added fee. Renters should ask the landlord first.

What is the downside of reverse osmosis?

At home: the upfront cost, regular filter changes and reject water, often five gallons or more per gallon you drink, per the EPA. RO also takes out most minerals. Read how reverse osmosis works for the full picture.

Is refill-station RO water the same as home RO water?

Both run water through a reverse osmosis membrane. The difference is who changes the filters: you at home, the operator at a refill machine. Check the machine before you fill, and find stations on any city page.