Water Filtration & Softeners
Your water quality depends heavily on where you live in the metro. Here's what's actually in your water, and what to do about it.
Get a Free QuoteWhat's Actually in Your Water?
Water quality in the Twin Cities metro isn't one size fits all. Minneapolis and Saint Paul treat and soften their water before it reaches your tap. Most suburbs pull from groundwater wells and deliver it with little to no softening, and it shows.
City Water: Treated & Softened
Both cities draw from the Mississippi River and run it through lime softening at their treatment plants, bringing hardness down from the mid teens to roughly 5 to 6 grains per gallon. That's well below the 7 gpg point where most people start noticing hard water symptoms.
City water users typically don't need a softener, but chlorine or chloramine taste and aging lead service lines are real concerns worth addressing with filtration.
Suburban Groundwater: Hard & Untreated
Most Twin Cities suburbs pull water from wells drilled into mineral rich limestone and dolomite aquifers. It's disinfected but not softened before delivery. The result is some of the hardest water in the metro, and a strong case for a home softener.
Examples: Eagan 17 · Edina 17 · Woodbury 13–17 · Lakeville 18 · Hopkins 18 · Minnetonka 19 · Maple Grove 22–25 · Savage 23 · Shakopee 23 · Prior Lake 20 · Inver Grove Heights 20 (gpg)
Hard Water: Scale & Buildup
White residue on fixtures, spots on dishes, stiff laundry, soap that won't lather. If you're in the suburbs, this is almost certainly your situation.
Chlorine Taste & Odor
City water is disinfected with chlorine or chloramines. Safe, but noticeable in taste and smell, especially in drinking water and ice.
Lead in Older Homes
Saint Paul has documented lead concerns in homes with older plumbing or service lines. Lead has no taste or smell, so filtration is the only fix at the tap.
Drinking Water Purity
Beyond taste, some households want to remove PFAS ("forever chemicals"), nitrates, or other trace contaminants from drinking and cooking water.
Private Well Water
Well water in the metro can reach 35+ gpg and often contains iron, manganese, or sulfur that city systems treat but your well does not.
Total Home Coverage
Want the cleanest water at every tap: drinking, bathing, appliances, laundry? The gold standard pairs a softener with whole home filtration.
Water Filtration Systems
Filtration removes contaminants like chlorine, lead, PFAS, and sediment. The question is whether you need coverage at every tap in the house, or just at the kitchen sink for drinking and cooking.
Whole Home Filtration
Installed on the main supply line where water enters the home. Every tap downstream, including showers, appliances, and laundry, gets filtered water. The most complete approach, and the right choice for well water or anyone wanting chlorine free water at every fixture.
What It Removes
- Sediment, rust, and particulates
- Chlorine and chloramines (taste & odor)
- Volatile organic compounds (VOCs)
- Iron and manganese (with the right media)
- Hydrogen sulfide / sulfur odor
How It Works
- Multi stage: sediment prefilter → activated carbon → post filter
- Carbon media neutralizes chlorine and absorbs organic compounds
- Specialized media for iron, sulfur, or other well water problems
- Filter cartridges replaced every 6 to 12 months
Pros & Cons
✔ Pros
- Covers every tap and appliance
- Protects pipes and water heater
- Single maintenance point
- Ideal for well water
✖ Cons
- Higher upfront cost
- Does not remove hardness minerals
- Less effective on lead or nitrates without specialized media
Under Sink Kitchen Filter
Mounted under the kitchen sink and plumbed to a dedicated countertop faucet. Focuses on drinking and cooking water with a higher level of filtration, especially reverse osmosis, which removes contaminants whole home systems can't touch.
System Types
- Reverse Osmosis (RO): Forces water through a semi permeable membrane. Removes up to 99% of dissolved contaminants including lead, PFAS, nitrates, arsenic, and fluoride. The gold standard for drinking water, and it removes sodium added by a softener.
- Multi Stage Carbon: Excellent for chlorine, taste, and odor. Lower cost than RO, but less effective on heavy metals or dissolved solids without a dedicated stage.
What RO Removes
- Lead, arsenic, nitrates, fluoride
- PFAS / "forever chemicals"
- Chlorine, chloramines, and VOCs
- Dissolved solids, including sodium from softening
- Most bacteria and viruses
Pros & Cons
✔ Pros
- Highest purity drinking water
- Lower upfront cost than whole home
- Removes lead & PFAS
- Removes softener sodium
✖ Cons
- Kitchen faucet only
- RO wastes some water while filtering
- Slower flow at dedicated faucet
- Multiple filter stages to maintain
Filtration System Comparison
A quick reference to help narrow down the right fit for your home and water concerns.
| Feature | Whole Home Filter | Under Sink Carbon | Under Sink RO |
|---|---|---|---|
| Covers all fixtures | ✔ Yes | Kitchen only | Kitchen only |
| Removes chlorine / odor | ✔ Yes | ✔ Yes | ✔ Yes |
| Removes lead & PFAS | Specialized only | Partial | ✔ Yes |
| Removes nitrates | ✖ No | ✖ No | ✔ Yes |
| Handles iron / sediment | ✔ Yes | ✖ No | Prefilter needed |
| Removes hardness minerals | ✖ No | ✖ No | At that faucet only |
| Removes softener sodium | ✖ No | ✖ No | ✔ Yes |
| Upfront cost | $$ to $$$ | $ | $$ |
| Maintenance | Annual filter change | 6 to 12 month filters | Annual membrane + filters |
| Good for well water | ✔ Yes | Limited | With prefilter |
Water Softeners
If you're on city water in Minneapolis or Saint Paul, your water arrives already softened to around 5 to 6 grains per gallon, below the point where most people notice problems. You may not need a softener at all.
If you're in the suburbs on groundwater, it's a different story. Hardness of 15 to 25 gpg is the norm across much of the metro, well into the range where scale causes real damage to appliances, water heaters, pipes, and fixtures. At that level, a softener isn't a luxury. It's practical maintenance that pays for itself.
A softener treats hardness through ion exchange. The calcium and magnesium that cause scale bind to a resin bed inside the unit and get flushed out during a regeneration cycle using salt. What's left is soft water that's gentler on everything it touches.
We install whole home salt based ion exchange softeners, the proven industry standard for hard water. We size the unit to your household's daily water use and dial in the regeneration so you're not burning through salt unnecessarily.
What to Expect from a Properly Sized Softener
Note on sodium: Softened water contains a small amount of added sodium, roughly 20 to 40 mg per liter depending on your hardness. For most people this is negligible. If you're on a sodium restricted diet, an RO filter at your drinking water tap will remove it.
Extends Water Heater Life
Scale buildup is one of the leading causes of early water heater failure. Soft water keeps it running at full efficiency and can add years to its life.
Protects Pipes & Fixtures
Hard water scale builds up inside pipes, valves, and faucets, restricting flow and speeding up wear. Soft water stops that from the day it's installed.
No More Spots & Residue
Hard water leaves white deposits on dishes, glassware, shower doors, and fixture finishes. Soft water removes the source of that buildup.
Better Soap Performance
Hard water fights soap. Soft water lathers easily and rinses clean, so you'll use less shampoo, hand soap, detergent, and dishwasher pods.
Softer Laundry
Minerals trapped in fabric make clothes stiff and dull over time. Soft water keeps fabrics softer and brighter and helps them last longer.
Better Feel on Skin & Hair
Hard water leaves a mineral film after showering. Soft water rinses completely clean, and most households notice within a few days.
What Makes Sense Together
Filtration and softening do different jobs, and neither alone covers everything. Here are the most common pairings in the Twin Cities and who each is right for.
Softener + Under Sink RO
The go to for most suburban homes. The softener handles hardness at every tap, protecting appliances and plumbing. The RO delivers ultra pure drinking water at the kitchen sink and removes the sodium the softener adds.
Under Sink RO Only
For Minneapolis and Saint Paul homeowners happy with their already softened city water who want cleaner drinking water, especially in older homes with lead service lines or aging plumbing. No softener needed.
Softener + Whole Home Filter + RO
The complete solution for clean water at every fixture and premium quality at the kitchen tap. The whole home filter handles chlorine and taste, the softener handles hardness, and the RO delivers the cleanest drinking water.
Whole Home Filter + Softener + RO
Private wells face the biggest challenges: sediment, iron, high hardness, and no city treatment. The filter handles sediment and iron first to protect the softener's resin bed, the softener handles hardness, and the RO covers drinking water.
Water Treatment FAQ
Straight answers to what we hear most often from homeowners across the metro.
I'm in Minneapolis. Do I need a water softener?
I'm in the suburbs. Do I definitely need a softener?
Is Saint Paul water safe to drink without filtering?
Does a water softener make water safe to drink?
How do I find out my water hardness?
Can I install these systems myself?
Not Sure What You Need?
Tell us where you live and what you're dealing with. We'll give you a straight recommendation with no overselling and no guesswork. Just honest advice from a Master Plumber owned team.
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