SAFETY: Here’s why SPU says some West Seattleites are seeing ‘fibers’ in their water

We’ve routinely reported “brown water” sightings for years – so many at one point, Seattle Public Utilities did a system “flush” in West Seattle in 2016 to try to clear out the rust and other sediment that was getting stirred up. Recently, we heard from multiple West Seattle Junction-area apartment residents with a different sighting in their water – white hair-like “fibers.” Here’s one description:

The hair-like objects range up to about half an inch in length and there was consistently a few in any glass of water. I could not tell if they were plastic, organic, or what. My only rudimentary test showed that they do not dissolve in vinegar. There was no discoloration.

That resident had dealt with SPU and property management among others to try to solve the mystery. SPU is on the front lines in terms of water safety, so we asked them. Here’s what SPU spokesperson Brad Wong told us late today:

Seattle Public Utilities has analyzed water samples from the area around 42nd Avenue Southwest and Southwest Alaska Street in West Seattle after receiving reports from customers of microscopic strands or filaments in it.

SPU believes the strands are a result of a recent algae bloom in one of our water supply reservoirs, which has occurred seasonally for more than 15 years. The water is safe to drink because SPU has treated and disinfected it. The Cedar River supply does not have filtration, but meets treatment requirements with ozone, UV light, and chlorine.

Customers who have concerns can call SPU’s 24/7 Operations Response Center at 206-386-1800. Customers may choose to filter their drinking water or purchase bottled water but should not consider this necessary.

SPU will contact customers who called with concerns and continue to monitor the situation.

The response didn’t explain why these complaints were mainly coming from The Junction; our tipster says the SPU person to whom they spoke didn’t have an explanation for that either. The reader quoted above says an SPU rep told them that the algae bloom was in <strong>Lake Youngs, a source for Seattle city water.

6 Replies to "SAFETY: Here's why SPU says some West Seattleites are seeing 'fibers' in their water"

  • Colleen Robertson May 30, 2025 (7:57 pm)

    We are experiencing brown water coming out of all of our taps as well this evening (Friday the 30th) and we live near the California Alaska Junction. I called it in with utilities and they said that the fire department has been testing hydrants in our area and that we should expect brown yellow or discolored water for about the next 24 hours. They said it is still safe.

    • Cori Roed May 31, 2025 (12:31 pm)

      I saw fire dept testing hydrants at 45th and alaska fri morning. 

  • bestseattle May 30, 2025 (10:28 pm)

    The calls all came from one area because it was first discovered in one specific apartment complex. People in that building were calling for weeks and SPU repeatedly told all of them that they didn’t know what was in the water and that it was not coming from their end. So if it’s just harmless algae that they’ve known about for 15 years, why wait to tell us?

  • Laura May 31, 2025 (10:59 am)

    They “believe” the strands are… but has SPU collected strands from residents and stuck them under a microscope to determine what they’re actually made of? 

    • bestseattle May 31, 2025 (1:23 pm)

      I took a sample to an accredited lab and they could not identify what the stands were but they did say that they were not something that was ever alive. I’m not a scientist but I think  that includes algae. I am now sending samples to a lab that specializes in algae to see what they say. If you want to do your own tests just search for “lab that can id algae”.  

  • B June 1, 2025 (12:41 am)

    Bottom line – should we rely on West Seattle tap water to be safe drinking water? I fill bottles every day.I used to Brita everything, but stopped a while back, feeling we are safe. However, I’ve always felt a filter, regardless of price, is worth the peace of mind.Where does West Seattle tap water stand right now?

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