Ever been stuck on a job site, staring at your empty water tank, and wondering if you can just hook up to the customer's spigot? It's tempting, I get it. But before you do, let's dive into why using a customer's water supply for pressure washing can be a risky proposition – and how to avoid potential headaches.
The Backflow Blues: Protecting the Water Supply
The biggest concern with tapping into a customer's water is backflow. Backflow happens when the water in your pressure washing system flows backwards into the customer's plumbing and potentially contaminates their potable water supply. This can happen due to pressure drops or fluctuations in the main water line. Think about it: your pressure washer is connected to hoses that have been on countless job sites, possibly sucking up all sorts of grime and chemicals. You don't want that going into their drinking water!
Most municipalities have strict regulations about backflow prevention, and rightfully so. You might need a Reduced Pressure Zone (RPZ) valve or other backflow preventer installed on your pressure washer. These devices are designed to stop contaminated water from flowing back into the main supply. Check your local regulations and make sure you're compliant. Fines for backflow violations can be hefty, and nobody wants that.
Meter Matters: Who Pays for the Water?
Beyond the risk of contamination, there's the simple question of who's paying for the water. Pressure washing can use a lot of water, especially on larger projects. If you're using the customer's water, you're essentially adding to their water bill. This can lead to disputes and unhappy clients.
Pro Tip: Always discuss water usage upfront. If you plan to use their water, factor the estimated cost into your bid. A simple solution is to offer a small discount to cover the water usage, or include a line item in your contract that clearly states how water usage will be handled.
Protecting Your Equipment and Reputation
Water pressure and quality can vary significantly from house to house. Some homes have well water, which can be hard on your equipment due to sediment and mineral content. Low water pressure can also damage your pump or reduce your cleaning efficiency.
Before hooking up, ask the customer about their water source and pressure. If they have well water, consider using a water filter to protect your pump. If the pressure is too low, you might need to bring your own water tank and booster pump. Remember, taking a little extra time to prepare can save you from costly repairs and maintain your professional reputation. Showing them you care about their water quality will also help build trust.
Self-Sufficiency: The Best Approach
Ultimately, the safest and most professional approach is to be self-sufficient. Investing in a water tank and a transfer pump eliminates the risk of backflow, water bill disputes, and equipment damage due to unknown water quality. It also gives you more control over your work. You can fill your tank from a reliable source and be confident that you have enough water to complete the job efficiently. It might seem like an upfront investment, but it pays off in peace of mind and a more professional image.
So, while borrowing water from a customer might seem like a quick fix, it's often more trouble than it's worth. Protect yourself, your equipment, and your customers by understanding the risks and taking the necessary precautions. A little planning can go a long way in this business.


