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27-08-2012, 09:32
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#1
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Registered User
Join Date: May 2006
Location: Nyack, NY
Boat: Westsail 32
Posts: 1,698
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How Long Does Potable Water Keep
Was as a club function this weekend speaking with a gentleman who seems like a very knowledgeable guy/ scientist/ sailor. At one point the discussion turned to water storage and he made the statement to me that drinking water should only be stored for a very short period of time before it starts to become usable, a couple of weeks.
I had always thought water can be stored almost indefinatly remember seeing all the drums of water in fallout shelters in the U.S that had been there for years, as well as all the municipal storage tanks that I don't think get used and replenished every couple of weeks.
So the question is how long does drinking water keep in tanks on a boat before it should be changed?
__________________
"All men are created equal, some just more than
others" KD2RLY
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27-08-2012, 09:58
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#2
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Registered User
Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
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Re: How Long Does Potable Water Keep
 I would think it would depend on the container! if it's air tight, and out of sunlight it should last longer then that !! Ive had water tanks go skunkie, after sitting for a few mos, but they have vents and are open to the air ! ya need to drain them or treat them before ya store your boat for any lenght of time !! and Ive carried water in jerry jugs for way longer then 2 weeks and it was still drinkable ! sounds a little funny to me ?
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Bob and Connie
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27-08-2012, 10:45
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#3
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Registered User
Join Date: Jun 2008
Location: Tampa, FL
Posts: 5,032
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Re: How Long Does Potable Water Keep
It also depends on the water. If it is from a municipal system where they treat the water with chlorine then it should last longer than if, for instance, it was collected rainwater. And if you put a teaspoon of chlorine per 5 gallons into it, it will last just fine for many months.
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27-08-2012, 11:01
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#4
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Registered User
Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 3,645
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Re: How Long Does Potable Water Keep
Quote:
Originally Posted by cburger
I had always thought water can be stored almost indefinatly remember seeing all the drums of water in fallout shelters in the U.S that had been there for years, as well as all the municipal storage tanks that I don't think get used and replenished every couple of weeks.
So the question is how long does drinking water keep in tanks on a boat before it should be changed?
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It's a function of the container. A boat's water tank(s) are the worst type and it could be argued that water therein can start to deteriorate immediately - the point is it will deteriorate and you don't know when.
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27-08-2012, 11:15
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#5
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Marine Service Provider
Join Date: Jan 2011
Location: St. Petersburg, FL
Boat: Retired Delivery Capt
Posts: 3,737
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It is a function of the water quality at that location, type of disinfection, cleanliness of the container, how much air there is in the container, temperature and how much light gets on the water. In theory you could add Cl to keep the water from developing coloforms, etc. But if you are going to push it, Adding a 2 micron backpacker water filter for the water consumed without boiling might be prudent.
I specify water quality at the location since the utility may deliver great water to the marina, but the pipes that supply your dock could have any of several issues that could lower water quality or deliver water with a Cl demand that will reduce the "shelf life" of the water.
Bill
__________________
"Whenever...it requires a strong moral principle to prevent me from deliberately stepping into the street, and methodically knocking people's hats off- then, I account it high time to get to sea..." Ishmael
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27-08-2012, 11:32
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#6
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Registered User
Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 3,645
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Re: How Long Does Potable Water Keep
Quote:
Originally Posted by Snore
In theory you could add Cl to keep the water from developing coloforms, etc.
Bill
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??????????
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27-08-2012, 11:49
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#7
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Registered User
Join Date: Jun 2010
Posts: 549
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Re: How Long Does Potable Water Keep
I believe this all started with the FDA, by saying that all products had to have a shelf life. Then comes bottled water companys and having to put a shelf life on their product.....water!
Anyone here know how to destroy water? Not contaminate it but destroy it into non-existance? LOL, You can't! Vapor, ice, liguid, it all comse back.
If properly stored from contaminants it lasts a few million years. If in doubt, add a drop of idonie or Cl and let it set, stir well, bottoms up!
There are icebergs breaking off exposing ice thosuands of years old, get a chunk, melt it and enjoy!
Oh, now I need to go buy another jug for my cooler, it's outdated....LOL
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27-08-2012, 11:56
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#8
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Registered User
Join Date: Mar 2006
Posts: 1,594
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Re: How Long Does Potable Water Keep
It depends...on how thirsty you are...
Drinking ones own urine has been done to survive....
All joking aside, I sure hope my water hasn't been killing me slowing as it is ALWAYS more than a few weeks old..
Was/is he in the "Drinking water for sale business"?
I personally rate this "pants on fire", BUT I bet a few minutes on google will clear up any doubt as to whether it holds water or not...Pun intended..
Here's an answer...
Just treat it for LONG term storage...I do that
http://www.ehow.com/how_5580108_trea...r-storage.html
__________________
Randy
Cape Dory 25D Seraph
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27-08-2012, 12:02
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#9
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Senior Cruiser

Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,307
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Re: How Long Does Potable Water Keep
From personal experience it seems to depend mainly on the water, at least as long as we are talking boat tanks and not sealed containers. As already pointed out, water treated with chlorine can last a long time but chlorine does dissipate over time if vented.
But even very pure water, if exposed to the environment like a vented tank and if not chlorinated I have had start smelling rotten in a couple of weeks.
If you put pure water containing no bacteria, algae or other living organisms into a totally sealed container then the shelf life would be pretty much indefinite.
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The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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27-08-2012, 16:57
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#10
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 21,510
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Re: How Long Does Potable Water Keep
Ask him how often he changes the water packed inside the liferaft.
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All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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27-08-2012, 17:28
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#11
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֍֎֍֎֍֎֍֎֍֎
Join Date: Apr 2006
Posts: 15,136
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Re: How Long Does Potable Water Keep
It all depends on the specifics. IF the water has been ultra-sterilized, if the container was sterilized, if the water is stored in a cool dark place? You'll see a lot of bottled water sold with a two-year "use by" date.
If you just take tap water and pour it into a bottle, and put the bottle in the sun? Well, some of the relief workers in Katrina saw water turning green from algae growth within DAYS of arrival. That's for "freshly" bottled water, bottled and shipped to the site in a hurry.
So, sterilize the water (boiling or chemicals), sterilize the containers (home brewers do this all the time, often with sulphites or bleach), keep it cool and dark, and you should be able to rely on at least a year. Or skip all that, and enjoy all the nutritional benefits of algae and critters.
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27-08-2012, 17:41
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#12
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Registered User
Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
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Re: How Long Does Potable Water Keep
 We just bought a few more gallons( we live in So. Louisiana) and the date is 7 Month of 2014, so I guess that sorta puts a question out there LOL I guess he was talking about some other type water ?? just sayin the Gov puts dates on everything ! and waters 2 yrs !
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Bob and Connie
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27-08-2012, 18:13
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#13
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Senior Cruiser

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,598
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Re: How Long Does Potable Water Keep
you might want to read this!
before throwing away your out of date water in pet bottels.....
BBC NEWS | Africa | Using the sun to sterilise water
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28-08-2012, 14:26
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#14
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Boating writer, book author

Join Date: Jul 2010
Location: On the Go
Boat: Various
Posts: 753
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Re: How Long Does Potable Water Keep
To all the GREAT comments above I'd add that a belt-and-suspenders approach is to have a compact water treatment system on board. If water becomes suspect, retreat. This is a huge topic with much to be learned about water containers, water storage, water treatments, types of hazards, etc. For long-term storage I'd order from one of the emergency/survivalist suppliers.
__________________
Janet Groene
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28-08-2012, 14:45
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#15
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Registered User
Join Date: Jan 2012
Location: Vancouver, BC
Posts: 382
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Re: How Long Does Potable Water Keep
Berkey.
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