How to pay your Longmont water and city utility bill
Longmont Utilities offers three main ways to pay: online through their website, by phone, or by mail. The fastest and most convenient method is online payment through the City of Longmont's bill pay portal, which processes immediately and requires no fees. You can also set up automatic monthly payments so the bill is paid on the same day each month without you having to remember.
If you prefer to pay by phone, call Longmont Utilities Customer Service at 303-651-8601 during business hours. For mail payments, send your check or money order to the address printed on your bill. Mail payments typically take 7 to 10 business days to reach the city and post to your account, so plan ahead if your due date is approaching.
Key Takeaways
- Online payment through the City of Longmont website is free, immediate, and available 24/7 without setup fees.
- Automatic payment enrolls you in monthly billing on the same date, which prevents missed payments and late fees.
- Phone payments are available during business hours at 303-651-8601 and take effect the same day you call.
- Mail payments require 7 to 10 business days to process, so send them at least two weeks before your due date to avoid late charges.
- Your bill shows the due date, the amount owed, and your account number — all information you need to pay online or by phone.
Paying online through the City of Longmont portal
Go to the City of Longmont's official website and look for the "Pay My Bill" or "Utilities" section. You will need your account number (found on your bill) and either a checking account, savings account, or debit card. The portal accepts ACH bank transfers and card payments with no transaction fee added by the city.
Enter your account number, the amount you want to pay, and your payment method. Review the details before confirming. The payment posts immediately to your account, and you will receive a confirmation number on screen — save or print this for your records. If you pay after business hours, the transaction still processes right away, though it may not show in your account balance until the next business day.
Setting up automatic monthly payments
Automatic payment is the easiest way to ensure your bill is never late. On the City of Longmont's bill pay portal, select the option to enroll in automatic payments. You will choose a day of the month (usually between the 1st and the 28th) when the payment will be withdrawn from your bank account or charged to your card.
The city will charge you the full amount due on your bill each month on that date. If your bill varies month to month — which is common for water usage — the amount withdrawn will change accordingly. You can change your payment date or cancel automatic payments at any time through the portal. Automatic payments do not lock you into a contract; you remain free to adjust or stop them whenever you choose.
Paying by phone or in person
Call Longmont Utilities Customer Service at 303-651-8601 to pay by phone. Have your account number and payment method (checking account, savings account, or debit card) ready. The representative will process your payment over the phone, and it will post to your account the same day. Phone payments are available during regular business hours; call ahead if you need to confirm the hours.
Some Longmont city offices also accept in-person payments during business hours, though online and phone payment are faster and do not require you to travel. If you prefer to pay in person, contact the main utilities office to confirm the location and hours before you visit.
Paying by mail
Write a check or money order for the amount shown on your bill. Include your account number on the check. Mail it to the address printed on your bill — this is usually the Longmont Utilities billing office. Do not mail cash.
Mail payments take 7 to 10 business days to arrive and post to your account. If your due date is fewer than 10 days away, paying by mail risks a late fee. Send mail payments at least two weeks before the due date to be safe. Keep a copy of the check or the payment stub from your bill for your records.
Understanding your due date and late fees
Your bill shows a specific due date — typically 15 to 20 days after the bill is issued. Payment is considered on time if it is received by that date. Online and phone payments count as received on the day you submit them. Mail payments count as received on the day they arrive at the city office, not the day you mail them.
If your payment is not received by the due date, Longmont Utilities will charge a late fee. The amount varies but is typically a percentage of your bill or a flat fee — check your bill or contact the utilities office for the exact amount. If you are struggling to pay your bill, contact Longmont Utilities to ask about payment plans or hardship programs that may be available to you.
What to do if you cannot pay on time
Contact Longmont Utilities Customer Service at 303-651-8601 as soon as you know you will miss the due date. The city may offer a payment plan that spreads your balance over several months, which avoids a late fee and keeps your service active. Payment plans are not automatic — you must request one before the due date passes.
If you are facing a hardship — job loss, medical emergency, or other crisis — ask about assistance programs. Longmont may have local programs or be able to refer you to nonprofits that help with utility bills. The sooner you call, the more options are available to you.
Frequently Asked Questions
Can I pay my Longmont bill without creating an online account?
Yes. You can pay by phone at 303-651-8601 or by mail without setting up an account. Online payment through the city portal does not require you to create a login — you can pay as a guest using just your account number and payment method.
Is there a fee to pay online or by phone?
No. The City of Longmont does not charge a fee for online or phone payments. If you use a third-party payment service or your bank's bill pay feature, check whether that service charges a fee — the city itself does not.
How do I know my payment went through?
Online and phone payments show a confirmation number immediately. Save or write down this number. Mail payments take 7 to 10 days to post. You can check your account balance on the city's portal or call 303-651-8601 to confirm the payment has been received.
What if I overpaid my bill?
Contact Longmont Utilities at 303-651-8601. The city will apply the overpayment to your next bill or issue a refund, depending on your preference. Do not assume the overpayment will automatically carry forward — confirm with the utilities office how it will be handled.
Can I set up automatic payments for a partial amount instead of the full bill?
Most automatic payment systems charge the full bill amount each month. If you want to pay a fixed amount instead, contact Longmont Utilities to ask whether that option is available. Otherwise, you can make manual payments online or by phone for any amount you choose.