ABCWUA hard water and your cooler pump: the bleed-off line most Albuquerque coolers are missing

September 8, 2026

Here is a sentence from the Albuquerque Bernalillo County Water Utility Authority’s own drinking water FAQ, in the section explaining total dissolved solids: “When water evaporates or is heated, dissolved minerals are left behind. These dissolved minerals are the residue that collects on evaporative coolers during the summer months.”

The utility that sells you the water tells you, in writing, what it does to your cooler. Almost nobody in this city acts on it. This article is about the one inexpensive part that does act on it, why most coolers here do not have a working one, and what it is costing.

What is actually in the pan

Albuquerque’s supply is not one water. Since December 2008 the system has blended purified San Juan-Chama surface water with treated groundwater from both sides of the river, and it delivers that blend through 20 distribution zones with separately published water quality results. The Authority describes the hardness across those zones as ranging from moderately hard to hard, and it publishes the conversion so you can do the arithmetic yourself: divide hardness in parts per million by 17.1 to get grains per gallon. Third-party compilations of the 2024 zone reports put the system average near 141 milligrams per liter, about 8.2 grains per gallon, with individual zones from 45 to 243. Your zone is knowable; the Authority publishes a map.

Now think about what a cooler does to that water. It sprays it over a pad, blows air through it, and evaporates a share of it into your house. The water leaves as pure vapor. Every dissolved mineral it was carrying stays in the pan. Fresh water comes in through the float valve to replace the volume, carrying its own minerals with it. Nothing removes mineral. So the concentration in that pan climbs, all day, all season.

By August, a cooler running without any form of bleed-off is circulating water several times harder than what comes out of your tap. Not slightly harder. Several times. That is the water your $150 to $400 pump is sitting in.

What a bleed-off line does

A bleed-off is a small tube that continuously dumps a trickle of pan water to waste while the cooler runs. Because the water leaving through that tube carries mineral with it, and the water arriving through the float does not carry as much, the concentration in the pan stabilizes instead of climbing. That is the whole mechanism. It is not filtration, it is dilution.

A purge system does the same job differently, by draining the pan on a cycle and refilling it with fresh water. Phoenix Manufacturing’s Pro-Clean system on the AeroCool Pro Series does exactly this, draining and washing the unit daily, and the manufacturer claims it saves as much as 3,000 gallons a month compared with a standard bleed-off arrangement. Either approach works. Neither one existing is the problem.

Why most Albuquerque coolers do not have a working one

Four reasons, roughly in order of how common they are.

It was never installed. Plenty of coolers get set on a curb and connected to water and power, and nothing else. If nobody ran a discharge line, there is no bleed-off.

It was installed and then capped. This is the most common one. A homeowner sees a tube dripping water off the roof, decides the cooler is leaking, and crimps or plugs it. The cooler stops dripping and starts dying. If you have crimped one, uncrimp it.

It scaled shut. The small orifice on a bleed fitting is exactly the sort of thing the water in the pan closes off, which is a special kind of irony. A bleed-off nobody checks is a bleed-off that stops working after a couple of seasons and nobody notices.

The discharge had nowhere to go. This is the legitimate reason, and it is the reason pricing is done at the visit rather than on a list. Water Authority ordinance defines water waste as any water other than natural precipitation flowing or spraying into a public right-of-way, a municipal storm drain, or adjacent private property, and reports come in through an online form with at least one warning notice before a fine. So a bleed-off cannot simply run into the street. It needs a drain, a downspout that leads somewhere sensible, a planting bed that can use it, or a purge system that dumps on a schedule to a proper discharge.

What it costs you not to have one

The failures line up in a predictable order, and they are all on the pricing page.

Run the arithmetic on a five year horizon. Without a bleed-off, a typical Albuquerque cooler on city water buys two or three pumps, a float or two, a fresh set of pads every spring, and probably a distribution manifold. With one, that becomes roughly one pump, one float, and either annual aspen or a single rigid media set carried across four or five seasons. The bleed-off itself is quoted with the visit and is a fraction of any single one of those line items.

It is worse east of the mountains and across the river

The city’s blended supply is not the hardest water in the service area. Rio Rancho draws entirely from the Santa Fe Group aquifer. Out in Tijeras and Edgewood, every public system is groundwater with no surface water blended in at all: EPA drinking water records list the Village of Tijeras system, Entranosa Water Association, and EPCOR’s Edgewood system all as groundwater community systems, alongside a string of very small associations and even a hauled-water operation with about fifty connections. Private domestic wells across Corrales, Placitas, and the East Mountains are harder still and treated by nobody.

One caution for anyone on hauled water into a cistern: a continuous bleed is the wrong tool, because you are paying by the truckload. A cyclic purge, or simply a disciplined pan clean at mid-season, makes more sense. Say so when you book and we will price it that way.

What to do about it this week

1. Go look. Find out whether your cooler has a bleed or purge line, and whether it is flowing. Five minutes.
2. If it is crimped or capped, that is your answer. It was doing its job and someone stopped it.
3. If there is none, ask for one on the next visit. Add it at the spring start-up or with any repair; it is far cheaper as part of a visit already scheduled.
4. Look up your distribution zone. The Water Authority publishes results by zone. Knowing whether you are at 45 or 243 milligrams per liter tells you whether aspen pads are a reasonable choice or a yearly tax.
5. Do not expect a rebate for it. The Water Authority rebates washing machines, trees, rainwater harvesting, xeriscape, and irrigation efficiency, not coolers. PNM’s rebates, up to $400, apply to buying a qualifying new unit rather than improving an old one; the permits, rebates, and water page has the terms.

The pump that fails in the middle of July is almost never a bad pump. It is a pump that spent two summers in concentrated mineral because a two dollar tube was crimped shut. The pump not pumping page covers what that failure looks like from inside the house, and the repair cost calculator prices it before you call.