Why Portland Should Have Kept Its Water, Urine and All

Ars Technica has nothing good to say about the scientific understanding (or at least public understanding) that led Portland to drain 38 million gallons of water after a teenage prankster urinated into the city's water supply. Maybe SCADA systems shouldn't be quite as high on the list of dangers, when major utilities can be quite this brittle even without a high-skill attack.

Comments

Discussed to death on Bruce Schneier's blog...

[Anonymous Coward]

Discussed to death on Bruce Schneier's blog. Long story short: The draining is part of a political fight between two groups who want to control and monetize the water supply. All in a city of nuts who, in this day and age, drink untreated water direct from uncovered reservoirs and streams. A lot of things to worry and wonder about there...

Re:Don't tell them that...

[Solandri]

We don't filter the water. We have an EPA waiver not to have to filter our water. Only one in the country, since the water up in the Bull Run Watershed is so pristine (no human activity allowed in the entire watershed area, over a hundred square miles, 1/3 of the water is supplied by dew drip off of fir trees).

That doesn't change the fact that fish, birds, frogs, etc crap in the water. This whole thing is the same reason a lot of people believe in homeopathy - the idea that extremely diluted quantities of a beneficial substance still carry the same benefits. Homeopathy is basically the converse of the disgust reaction we have to inconsequentially miniscule contamination - the idea that extremely diluted quantities of a harmful substance still carry the same harm. The ISS has one of the most sophisticated water reclamation systems ever made, whose filtration provides cleaner water than what you get out of the tap. But people are still "grossed out" over the fact that astronauts are effectively drinking their own pee. Out of sight, out of mind.

The environment is dirty, and our bodies are fully capable of surviving with that dirt. This incessant demand for absolute cleanliness is probably the cause of the rapid increase in allergy rates. The prevailing theory is that allergies are result of over-cleanliness. Our immune systems are supposed to gradually build up resistance and tolerance to all sorts of pathogens and contaminants. But our modern, ultra-clean standard of living deprives our immune systems of gradual exposure to those substances. Then when we encounter it for the first time, our body goes nuts and overreacts, causing an allergic reaction.

Our water comes from the source much cleaner than would come out of the filtration systems used in other cities.

The cleanest water you can get is distilled. You slowly raise the temperature to boil off contaminants with a boiling point lower than water. At the boiling point of water you're getting pure H2O. The residual is everything with a boiling point higher than water. While it's absolutely clean, it's actually bad for you because it lacks minerals and salts your body needs, and the lack of dissolved content means metal from the pipes carrying it leech into it at an accelerated rate. So it's instead packaged in plastic or glass bottles and sold in stores. Rainwater is effectively distilled, except it picks up a lot of contaminants as it floats through the air, then falls down to the ground.

The next cleanest you can get is reverse osmosis filtered. The pores in the filters are so small that nearly all contaminants are removed. Like distilled water, it's actually too pure. They have to add minerals and salts back into it for health and taste reasons. While it's too expensive to use for most municipal water supplies, a few cities on islands or in extremely dry regions do use them to provide tap water.

Then come the spring waters, which are naturally filtered through miles of sand and rock.