Does Your Water Smell Like Sulfur or Rotten Eggs?

Find out how to fix this problem, quickly–with the help of your friendly Culligan Man

What our clients say

There’s a reason Countryside Culligan Water is the best water treatment company in Tomah WI and Winona MN with over 300 4.9-Stars Google Reviews.

Great service and very happy with my water quality
Excellent service and excellent people. Culligan products have made a difference in our home’s drinking water and laundry results. Glad to have them in our community.
My mom passed away and we were getting ready to sell the house. The issue was that she rented the water softener. The staff at Countryside Culligan were very patient, helpful and went above and beyond!!! They answered all of my questions and concerns. They gave me options for the rental water softener. I called them several times with questions about the water softener, what do the new owners need to do and more. They were very welcoming and helpful and professional! Thank you for everything y'all did for me!
My name is Michael not Mike!!!
Great company! They really met the needs of our small business. I feel good about knowing our water is safe
Culligan’s has always been A+ in service and communication
Had Red at the house great technician, super friendly and taught me about salt pellets being made from salt powder and glue! Salt crystals from here on out.
Good product and friendly customer service, especially Red, our service technician
Delivery service review: they do a great job! Very friendly and helpful.
I love not having to worry about buying and changing the salt in my water softener. Red and his team members at Countryside Culligan take care of that for me. Service has always been great from our first contact with the company. They are always polite, friendly and efficient. Highly recommend this company.
The driver said he would carry the bottles up my deck
When our old water softener broke, Culligan was fast to come in and offer a solution. We got a new water softener and oh my gosh the difference in our water quality is actually crazy. Makes me wonder if our old softener actually ever worked at all. Thank you so much!
We are very happy with our new softener! Customer service was great and installation went smoothly.
The service is outstanding! Very timely, communication has been fantastic, and helpful deliveries. Having soft water changed a lot of fir, the life of some of our appliances, decreased plumbing issues, and our skin is amazing. Highly recommend!
I moved back to Winona, MN, in August of 2025 and knew I wanted a water softener and filtration system for my home. I called Culligan and Nate came over to share the details. I now have a softener, whole house filter AND reverse osmosis water. Frankly, I don't know how I managed before the reverse osmosis. I cannot say enough good things about my experience with Culligan. Nate was patient and listened to my questions/concerns and took great care to make sure I was satisfied with the answers. Front office crew is also amazing whenever I have a question or need support. Totally thrilled with my whole house system!P.S. This is not my first experience with Culligan. They never disappoint!
The sales team was very Knowledgeable and the install team was very professional.
Nate provided information about the quality of my water and what could be done to improve it. He suggested products with zero pressure. Sheldon did great work installing. His knowledge and familiarity with the products made the process easy. After using Culligan just one day the difference is apparent. I would highly recommended using Culligan. Especially if you are on a private well.
Culligan Winona has great service and are easy to work with.
The order and install was a breeze! We love the products, especially the RO system for quality drinking water. Our hard water deposits have been reduced by about 90%. Would definitely recommend to others.
Thank you to Nate and everyone at Culligan. We are loving our reverse osmosis water system - so glad we were able to ditch the plastic bottles. Would highly recommend Culligan for your water needs!
Water Softener and reverse osmosis water filter.Replaced old softener and added the water filter.I opted for equipment purchase rather than rental, and did opt for salt delivery and periodic inspection.Overall the attentive service and familiarity with equipment and installation, along with a follow up check left me quite satisfied with Culligan Winona.
Had a new drinking water system installed, Nate had been out for softener system and testing my water. Mentioned about a drinking water system and they ended up having a promotion out for the system so I signed up. They had it installed the next week and the water tests are coming back squeaky clean!
Very friendly. They helped us with all of our questions, even the oddball ones.
Great place great people fast unloading
Got my new Culligan UV system installed to help knock out harmful bacteria levels coming from our well. Check it out next to my Culligan of Winona water softener!
I had a small leak, called and talked to Sara. She had me send a picture to her phone. The next thing I know She tells me Brandon is on his way. It didn't take long for him to fix it. They were both helpful and friendly.Joe Luby
Great people and a great company!!
We're a couple weeks in with our water filter and couldn't be happier! This has made our well water taste and look so much better, and I feel better having our kids drink this! If you're debating getting one, it's well worth it!
Service and people are wonderful! Love my water softener less detergent for clothes dishes my hair is soft soft! Love it!
We just recently updated our old water water softener to a new Culligan HE Smart Softener. Excellent product! Being a "smart" softener it continuously monitors your water usage and recharges when necessary. Saving a lot of salt. It's got an app that updates you on satus, water usage, and maintenance. Very nice machine. Culligan of Winona was prompt, experienced, and accurate in our quote. Definitely would recommend!
My Serviceman replaced a faulty faucet and even provided one with the same finish as my new sink faucet. How neat was that?
Excellent service and great representative named John. Highly recommend.
The service technician did an excellent job changing out my filters in my Culligan drinking water system. Cleaned up after and told me what he did. Thanks for the great service and excellent drinking water.
Randy and Todd here from Skunk Coulee Road Galesville. Without the great folks at Culligan in Winona, we would have the worst well water. Thank you for past 8 years. And when a code popped up on the softener last weekend, and one phone call Monday morning they had the issue taken care of within hours. Thanks for the continued GREAT SERVICE!
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100% Satisfaction Guarantee Worlds most efficient NSF Certification | Countryside Culligan Water UL Certified Company in Winona MN, Sparta WI, Tomah WI, Goodview MN, Mauston WI, St. Charles MN
 Water Quality Association Tested and Certified Under Industry Standards

Usually, if your water smells like sulfur or rotten eggs, the reason is because your water has high Hydrogen Sulfide (H2S) content.

H2S is a gas that is released from the earth and finds its way into groundwater. It’s especially common in well water located near shale, sandstone, coal, peat, or oil.

(Occasionally, a rotten-egg smell in your water could also be caused by a water heater or by sewage pollution in your water. If you’re on city water, the most likely explanation is your water heater.)

A rotten-egg smell in your water may be strongest right after turning the water on, as heat forces the gas out of the water and into the air
H2S dissolves in water to create a weak acid that can corrode metal pipes

Negative Effects of H2S

In addition to potential health risks, having H2S in your water can cause all sorts of annoying problems. H2S in your water can:

  • Cause coffee and tea to be discolored and taste funny
  • Corrode metals (steel, copper, iron, brass), including silverware
  • Cause foods cooked with water to taste “off”
  • Create yellow or black stains in your bathroom and kitchen 

How Do You Fix It?

Here at Culligan, you can find everything you need to get rid of H2S and that sulfur/rotten-egg smell from your water.

The first step we have to take is to test your water, so we can be sure of the real cause of the rotten-egg smell.

Fortunately, here at Culligan we offer this service free. One of our water experts will come to your home to test the water (you can’t send it away to a laboratory because H2S is a gas and could dissipate during transport) and let you know the source of your rotten-egg smell. You’re under no obligation whatsoever. 

Culligan water treatment systems can completely remove the rotten-egg smell from your water

To get in contact with us and schedule your free water test, just fill out this quick form to contact us: