Seattle is swimmable. Lake Washington, Green Lake (both fresh water), and the Puget Sound (salt water) are swimmable in city limits. I swim in lake Washington 3 times a week May - October.
As in another comment here about Copenhagen, you cannot swim after hard rain because of how the sewer systems were designed. Seattle is famous for rain, but not the type of rain that will cause a spill over event often.
The county government also tests the water for bacteria and algae and reports the findings on their website and closures are signed at access points.
Also while there is a lot of private ownership of water access, there are 9 city beaches and something called street ends, which are public right of ways if a street ends at water, I swim from these all the time.
There was a company called pillsy[1] that used to make something similar, though it appears that they pivoted to do other connected medical devices[2].
one of the reasons that swimming records have continued to fall is they changed other rules to make swim faster while enacting stricter rules on suites.
There is now a wedge on swimming blocks that allow for faster starts (a little like track starting blocks)
They have also changed the breaststroke turn rule to allow for a dolphin kick.
>(6) Licensed outdoor play areas must be enclosed with a fence or barrier that is intended to prevent children from exiting and discourages climbing. If the outdoor play area is enclosed by a barrier that is not a fence, the barrier may be a wall constructed with brick, stone, or a similar material.
For some background a co-worker's wife works at one of the outdoor preschools and said that in order to be full time you have to have a fence in play space next to the indoor school.
We have outdoor preschools in Seattle, but because of how licensing works, my family can't use them. Outdoor preschools can only run for 4 hours usually 9:30-1:30, instead of full day, which is really what you need if you have two working parents.
I am a little surprised consumers are not buying: Seinfeld, Parks & Rec, and Friends. They can be had on DVD or digitally for less than a year of a streaming service, and it would free you from worrying about when the show will leave your particular streaming service of choice.
As in another comment here about Copenhagen, you cannot swim after hard rain because of how the sewer systems were designed. Seattle is famous for rain, but not the type of rain that will cause a spill over event often.
The county government also tests the water for bacteria and algae and reports the findings on their website and closures are signed at access points.
https://kingcounty.gov/en/dept/dnrp/nature-recreation/parks-...
Also while there is a lot of private ownership of water access, there are 9 city beaches and something called street ends, which are public right of ways if a street ends at water, I swim from these all the time.
https://www.streetends.org/about