Drought isn’t just a local problem anymore, it’s a regular thing water planners have to deal with. When rain disappears for months or even years, reservoirs shrink, aquifers dry up, and communities that built their systems on old rainfall averages suddenly don’t have enough water. The best way out? A mix of desalination and water conservation.
Why Saving Water Alone Isn’t Enough
Sure, conservation cuts how much water we use, but it won’t create new water. A community deep in drought can tell people to water less, install low-flow stuff, and stop outdoor watering, but they’ll still run short if their main water sources, like rivers, reservoirs, and aquifers, are too low. California’s drought from 2012-2017 showed this clearly. Even with big statewide efforts to save water, urban use dropped by 24%, but reservoir levels in the Sacramento-San Joaquin system still hit rock bottom. Conservation buys you time, but it doesn’t solve the problem of not having enough water to begin with.
That said, saving water is the cheapest part of any drought plan. The program figures that water-efficient fixtures and appliances can cut household water use by 20-30% without changing your quality of life. For cities, fixing leaky pipes, which lose about 15-30% of treated water in US systems, can get back a lot of water before you even need to find new sources.
Desalination: A Drought-Proof Water Source
Seawater desalination makes water no matter how much it rains, snows, or how rivers flow. It’s what water planners call a “drought-proof” supply, because the ocean doesn’t run out. For towns near the coast, or those close enough to pipe it in, desalination can give them a steady, reliable water supply even when other sources go up and down with the weather.
The cost of desalination has dropped a lot in the last 20 years. The shows that the price of SWRO has fallen from about $1,000 per acre-foot in the early 2000s to $700-$900 per acre-foot at new, large plants. This is thanks to better membranes, energy recovery tech, and smarter system design. To give you an idea, imported water in drought-hit California can cost $1,000-$1,500 per acre-foot when water is scarce.
The Carlsbad Desalination Plant in San Diego County, the biggest in the Western Hemisphere, makes 50 million gallons a day. It provides about 10% of San Diego County’s water and is a great example of how coastal areas can fight drought. The tracks similar projects popping up across Florida, Texas, and the Gulf Coast.
Inland Solutions: Treating Brackish Water
If you’re not near the ocean, you still have options. Brackish water reverse osmosis, which treats inland groundwater with salt levels between 1,000 and 10,000 ppm, is a proven technology used all over Texas, Arizona, New Mexico, and other dry western states. Brackish RO costs a lot less energy than seawater RO, usually 0.5-1.5 kWh per 1,000 gallons compared to 3-5 kWh for SWRO. It can tap into aquifers that are too salty to drink directly but are much less demanding than seawater.
The Texas Water Development Board has put money into many brackish groundwater desalination studies and projects. They know that places like the Permian Basin and other regional aquifers hold a lot of brackish water that can help stressed freshwater systems.
Wastewater Recycling: The Third Way to Fight Drought
Advanced treated wastewater, or “water recycling” as regulators call it, is becoming more and more accepted as a city’s water source in drought-prone areas. Indirect potable reuse (IPR) cleans wastewater to drinking water standards, then puts it into groundwater basins or surface reservoirs before we take it out again. Direct potable reuse (DPR), which cleans and delivers recycled water without a natural buffer, is now allowed in Texas and Colorado, and California is working on its rules.
Water recycling doesn’t make water disappear, it simply captures and reuses water that would otherwise be sent away. For inland communities that don’t have brackish aquifers or access to the coast, it’s the most affordable way to get more water without building brand new infrastructure.
AMPAC USA Drought Resilience Systems
AMPAC USA builds seawater and brackish water reverse osmosis systems, containerized emergency water units, and large-scale RO systems for drought resilience. Whether you’re a city planning for the future or an industrial site trying to avoid water shutdowns, our engineering team can figure out the right system for your water source and how much water you need.
Frequently Asked Questions
Can smaller towns afford desalination?
Yes, smaller seawater and brackish RO systems are available and make sense for communities with just a few thousand people. Sure, it costs more per gallon on a smaller scale, but it’s often still cheaper than trucking in water or relying on emergency supplies during a drought.
What about desalination’s environmental impact?
The main worries are how much energy it uses and what happens to the salty leftover water, called brine. Modern SWRO plants use energy recovery devices that cut power use by 50-60% compared to older systems. Brine is usually diluted and put back into the ocean under specific permits, and the effects are watched closely. Generally, they’re considered manageable at well-designed facilities.
How do conservation and desalination work together?
Saving water means you need less overall. This can reduce the size, and therefore the cost, of a new desalination plant. If a community cuts its water use by 25% through conservation, it needs a much smaller desalination plant to get the same water security. They really do complement each other, not compete.
Sources: | | | International Desalination Association
Conclusion
This post showed how emergency and military-grade water purification systems can quickly provide safe drinking water even in the toughest field conditions. If your organization needs deployable water treatment, AMPAC USA engineers portable and trailer-mounted systems built to work anywhere. Reach out to our team at info@ampac1.com or (909) 548-4900 to talk about your emergency water treatment needs.
AMPAC USA engineers custom water purification systems for commercial, industrial, and emergency applications — from 500 GPD to multi-million GPD. Trusted by municipalities, military, and industry worldwide.
