Where and how to pay Fairfax Water
Fairfax Water accepts payments through four main channels: online at their website, by phone, by mail, or in person at their office. The online portal at www.fairfaxwater.org is the fastest option — you can pay immediately with a bank account or debit card, and the payment posts within one business day. Phone payments go through their automated system at the number on your bill, also processed within one business day.
If you prefer to mail a check, write your account number on the check and send it to the address printed on your bill. Mail typically takes five to seven business days to arrive and process, so plan ahead if your due date is near. In-person payments at Fairfax Water's office in Fairfax City are processed the same day, but this requires a trip during business hours.
Set up automatic payments through the online portal if you want to remove the payment step entirely. You can choose your payment date each month, and Fairfax Water will deduct the amount directly from your bank account on that date.
Key Takeaways
- Pay online at www.fairfaxwater.org for the fastest processing, or by phone using the number on your bill.
- Mailed checks take five to seven business days to process, so send them at least a week before your due date.
- Your bill shows your account number, current charges, and the due date — keep this information handy when you pay.
- Automatic payments through the online portal remove the need to remember to pay each month.
- If you cannot pay the full amount by the due date, contact Fairfax Water directly to discuss payment arrangements before your account falls behind.
Reading your Fairfax Water bill
Your bill shows three main sections: your account information at the top, a breakdown of charges in the middle, and payment instructions at the bottom. The account information includes your service address, account number, and the billing period (usually one month). This is the information you need when you call or pay online.
The charges section lists your water usage in gallons, your sewer charge, and any other fees. Fairfax Water charges based on the amount of water you use — the more gallons consumed, the higher your bill. Your bill also shows the due date and the amount owed. If you have been billed for a service call or a late fee, those appear as separate line items.
Compare your current bill to the previous month's bill to spot unusual changes. A sudden spike in water usage can signal a leak inside your home. If your bill seems wrong, note the specific charge and contact Fairfax Water with your account number and the billing period in question.
What to do if you cannot pay on time
Contact Fairfax Water before your due date if you know you cannot pay the full amount. Call the number on your bill and explain your situation. Fairfax Water may be able to set up a payment plan that spreads your balance over several months, which keeps your account in good standing while you catch up.
If your account falls behind, Fairfax Water will send you a notice of delinquency. At this stage, you still have time to contact them and arrange a plan. Waiting longer makes the situation harder to resolve — late fees accumulate, and your service can eventually be shut off if the account remains unpaid for an extended period.
Some residents may have access to utility assistance programs through their county or local government. These programs help people who face hardship paying their bills. Contact your local social services office or call 211 to learn whether such a program exists in your area and what the requirements are.
Understanding your water usage and charges
Fairfax Water charges a base fee for service plus a usage charge based on how many gallons you consume. The base fee covers the cost of maintaining the system and delivering water to your home, regardless of how much you use. The usage charge is where most of your bill comes from — it increases as your consumption increases.
Your bill measures water in units called hundred cubic feet (HCF), where one HCF equals about 748 gallons. If your bill shows 5 HCF, you used roughly 3,740 gallons that month. A typical household uses between 4 and 10 HCF per month, depending on family size and habits like lawn watering or pool filling.
Sewer charges are separate from water charges. Fairfax Water assumes that most of the water you use ends up in the sewer system, so your sewer bill is based on your water usage. If you have an outdoor meter or use water for irrigation that does not go into the sewer, you may be able to adjust your sewer charge — contact Fairfax Water to ask about this option.
Checking for leaks and reducing your bill
A sudden jump in your water bill often means a leak somewhere in your home. Check your toilet for a running leak by adding food coloring to the tank — if the color appears in the bowl without flushing, water is leaking. Listen for hissing sounds near your water heater or under sinks. If you suspect a leak but cannot find it, a plumber can locate it with specialized equipment.
Reduce your water usage by fixing dripping faucets, taking shorter showers, and running full loads in your washing machine and dishwasher. These changes lower your usage charges and reduce the strain on the water system. If you water a lawn or garden, do it early in the morning or late in the evening to minimize evaporation.
Fairfax Water provides a free water audit service that shows you where your household uses the most water. You can request this through their website or by calling. The audit helps you identify which changes will have the biggest impact on your bill.
Updating your account information and billing address
Update your mailing address, phone number, or email through the online portal at www.fairfaxwater.org, or call Fairfax Water directly. If you move within Fairfax Water's service area, notify them before you leave so they can close your old account and open a new one at your new address. This prevents bills from going to the wrong place and keeps your account history clear.
If you want to receive your bill by email instead of mail, you can set this up in the online portal. Email bills arrive faster and give you a digital record you can search and organize. You can also set up notifications that alert you when your bill is ready or when a payment is due.
Frequently Asked Questions
What if I pay online but my payment does not show up right away?
Online payments through the Fairfax Water portal typically post within one business day. If you paid on a Friday evening, the payment may not appear until Monday. Check your bank account to confirm the payment left your account, then wait one more business day before contacting Fairfax Water. Have your confirmation number from the payment ready when you call.
Can I set up a payment plan if I owe multiple months of bills?
Yes. Call Fairfax Water and speak with a representative about your situation. They can work with you to create a plan that lets you pay what you owe over time. The sooner you contact them, the more options you typically have. Waiting until your service is shut off makes negotiation much harder.
Why is my sewer bill so high compared to my water bill?
Sewer charges are based on your water usage, so they are usually similar to or higher than your water charge. If your sewer bill seems disproportionate, you may have a leak that is inflating your water usage. Check for leaks first, then call Fairfax Water to discuss your specific charges if the problem persists.
How do I know if Fairfax Water is my provider or if I use a different utility?
Check your bill — it will clearly state "Fairfax Water" at the top if they are your provider. If you are unsure, call the number on your water bill or visit www.fairfaxwater.org and use their service area map to confirm your address is in their territory.
What happens if my payment is late?
Fairfax Water charges a late fee if your payment does not arrive by the due date shown on your bill. The fee amount is listed in your bill or on their website. If your account stays unpaid for 60 days or more, Fairfax Water may shut off your service. Contact them immediately if you think your payment will be late.