Kauai County Water Department: Bill Pay, Phone, Hours and Address
Use official Kauaʻi Department of Water resources to pay your water bill online, by mail, in person, or parking-lot drop box. This guide covers the Koʻu Wai Customer Account Portal, customer service phone number, billing help, office address, lobby hours, emergency contacts, drop box hours, rates, forms, service issues, sewer-payment difference, map and FAQs.
If you are searching for county of kauai water department, choose your exact need below. Most users want to pay online, call customer service, visit the Līhuʻe office, use the drop box, mail a payment, report a water emergency, check water rates, submit a form, or confirm whether they need the water department or the County sewer payment portal.
Choose one option. The official action card below updates for online payment, account portal registration, phone support, office visit, drop box, mail, water emergency, service issue, rates, forms and sewer payment routing.
💳 Pay online — use the official Koʻu Wai Customer Account Portal
Use this for: paying your County of Kauaʻi Department of Water bill through the official customer account portal.
Keep ready: customer/account details from your water bill statement.
After payment: save confirmation number, amount, date and account details.
Kauaʻi Department of Water Quick Facts Before You Pay
The Department of Water, County of Kauaʻi provides official customer service, billing support, water payment options, forms, rates and service-issue routing for Kauaʻi water customers.
The official contact page lists the Department of Water address as 4398 Pua Loke Street, Līhuʻe, Hawaiʻi 96766, main phone (808) 245-5400, general email dow@kauaiwater.org, office hours Monday through Friday, 7:45 a.m. to 4:30 p.m., and lobby hours 8:00 a.m. to 4:00 p.m..
What This Kauai County Water Department Guide Covers
How to Pay County of Kauaʻi Water Bill Online
The safest online route is the official Kauaʻi Department of Water Pay Your Water Bill page. From there, customers can access the official Koʻu Wai Customer Account Portal.
Use the water bill statement to confirm your account details before paying. Do not use unrelated third-party pages if the account number, utility name or payment screen does not clearly match the Kauaʻi Department of Water.
Open the official water bill payment page
Go to the official Kauaʻi Department of Water Pay Your Water Bill page.
Use the Koʻu Wai Customer Account Portal
Open the official customer portal link from the Department of Water payment page.
Enter account details carefully
Use the name, account details and statement information exactly as shown on your bill.
Review account and amount
Confirm the account, service address, balance and any payment details before submitting.
Save confirmation
Save confirmation number, receipt, payment date, amount and account details until the payment posts.
Koʻu Wai Customer Account Portal Registration
The Koʻu Wai Customer Account Portal is the online customer portal connected to the Department of Water, County of Kauaʻi. The registration page asks customers to register with the primary account holder’s information as it appears on the bill statement.
If you have trouble registering, confirm the spelling, company name, account information and billing statement details. If the portal is unavailable or your account does not match, call the Department of Water for help.
Koʻu Wai Customer Account Portal
Primary account holder’s information as shown on your statement.
Online account access and water bill payment.
Call 808-245-5400 or email dow@kauaiwater.org.
Kauai Department of Water Phone Number and Customer Service
For general inquiries, billing questions, account help, customer service, forms, payment questions and department routing, call the Department of Water main phone number.
Kauai Department of Water Address, Office Hours and Lobby Hours
The official Department of Water office is located at 4398 Pua Loke Street, Līhuʻe, Hawaiʻi 96766. Use this office for in-person water department business during posted business and lobby hours.
Department of Water Office
4398 Pua Loke Street, Līhuʻe, HI 96766.
Official addressHours
Office: Mon–Fri 7:45 a.m.–4:30 p.m.
Lobby: 8:00 a.m.–4:00 p.m.
Before visiting the lobby
- Bring your current water bill or account number.
- Bring identification if you are changing account information.
- Bring payment method and any related documents.
- Visit during lobby hours, not only general office hours.
- Call first if your issue is urgent or service-related.
Kauaʻi Water Bill Drop Box Payment
The official Pay Your Water Bill page says customers may leave payment in the Department of Water parking-lot drop box Monday through Friday from 6:00 a.m. to 4:30 p.m.. The drop box is not accessible outside those hours and holidays.
Drop box is best for non-urgent payments. If your account has an urgent deadline, call the Department of Water first and ask which payment method posts fastest.
Department of Water parking lot
4398 Pua Loke Street, Līhuʻe
Monday–Friday
6:00 a.m.–4:30 p.m.
Not accessible outside listed hours and holidays.
Call 808-245-5400 before relying on drop box.
Pay Kauai Water Bill by Mail
The Department of Water pay page lists mail as one of the official payment options. Use the address and instructions shown on your bill statement or the official payment page before mailing.
Mail payment checklist
- Use the payment stub from your water bill when available.
- Write your account number clearly on the check or money order.
- Do not send cash by mail.
- Mail early enough for processing before any due date.
- Use online, in-person, or phone guidance if the bill is urgent.
Kauaʻi Water Emergency Contacts
The Department of Water contact page lists separate emergency numbers for business hours and nights/weekends. Use the right number so the issue reaches the correct crew faster.
Water emergencies: 808-245-5444
Water emergencies: 808-241-1711
Business hours service issues: 808-245-5444
Main phone: 808-245-5400
Report a Kauaʻi Water Service Issue
The official service issue FAQ says to report service issues during business hours by calling 808-245-5444. After hours, call Police dispatch at 808-241-1711, and they will contact the Department of Water standby crew for further investigation.
Call the correct number
During business hours, call 808-245-5444. Nights and weekends, call 808-241-1711.
Describe the issue clearly
Explain whether it is a leak, broken main, no water, low pressure, cloudy water, meter problem or other service concern.
Give exact location
Provide address, nearest cross street, landmark, visible water flow and whether the issue is on public or private property if known.
Stay safe
Avoid flooded roads, unstable ground, electrical hazards and open utility areas while waiting for help.
Kauai Department of Water Rates and Charges
The official Rates and Charges page explains that rates are based on water usage per 1,000 gallons and multiplied by the corresponding tier block. Customers are also charged a fixed monthly service charge and a power adjustment charge on the monthly water bill.
Before questioning a high bill
- Compare current use with past bills.
- Check if your bill moved into a higher usage tier.
- Check the fixed monthly service charge and power adjustment charge.
- Look for leaks in toilets, irrigation, hose bibbs, water heaters and service lines.
- Call the Department of Water with your account number if the bill still looks wrong.
Kauai Department of Water Applications and Forms
The Department of Water maintains official applications and forms online. The forms page says most Department of Water forms are interactive, allowing customers to complete them online, then print and submit by mail, fax or in person.
Complete online, print, then submit by mail, fax or in person as instructed.
Water service, account, clearance or department-specific requests.
Call 808-245-5400 before submitting if unsure.
Kauaʻi Water Bill vs County Sewer Bill
Do not confuse the Department of Water bill with the County of Kauaʻi sewer service bill. The Hawaii.gov online services page lists a separate Kauaʻi sewer payment service for bi-monthly County sewer bills through the County Division of Wastewater Management.
Use Kauaʻi Department of Water payment resources.
Use County of Kauaʻi sewer payment service if your bill is for sewer.
County Public Works Wastewater Management handles sewer-related forms and services.
Look at the agency name on the bill before paying.
Kauaʻi Department of Water Address, Map and Directions
The official Department of Water address is 4398 Pua Loke Street, Līhuʻe, HI 96766. Use this location for in-person customer service during lobby hours and drop box payment during listed drop box access hours.
Department of Water, County of Kauaʻi
4398 Pua Loke Street, Līhuʻe, HI 96766. Call 808-245-5400 before visiting for account-specific questions or urgent service issues.
Kauai County Water Department Phone Numbers, Address and Payment Details
Use this table when you need to pay, call, visit, report a water emergency, use drop box, check rates, submit forms, or make sure you are not confusing water and sewer payments.
| Need | Official detail | Best action |
|---|---|---|
| Online water bill payment | Pay Your Water Bill | Open official DOW bill-pay page and use the customer portal. |
| Customer account portal | Koʻu Wai Customer Account Portal | Register/login with information exactly as shown on your statement. |
| Main customer service | 808-245-5400 | Call for general inquiries, billing help and account questions. |
| Water emergency during business hours | 808-245-5444 | Call for urgent water emergency or service issue during business hours. |
| Nights/weekends emergency | 808-241-1711 | Call Police dispatch route for after-hours standby crew contact. |
| Office address | 4398 Pua Loke Street, Līhuʻe, HI 96766 | Visit during lobby hours or use drop box during posted drop box access hours. |
| Office and lobby hours | Office Mon–Fri 7:45am–4:30pm; Lobby 8am–4pm | Use lobby hours for walk-in service. |
| Drop box | Parking-lot drop box Mon–Fri 6am–4:30pm except holidays | Use for non-urgent payments only. |
Official Kauai Department of Water Links and Resources
Use these official resources first. They help avoid fake payment pages, wrong phone numbers, outdated forms and confusion between water and sewer bills.
🧾 Koʻu Wai Portal
Official customer account portal for Kauaʻi water customers.
Open Customer Portal☎️ Contact Us
Official Department of Water address, phone, hours and emergency contacts.
Open Contact Page📊 Rates and Charges
Official water usage, tier, service charge and power adjustment information.
Open Rates📄 Applications and Forms
Official Department of Water customer forms and applications.
Open Forms🚨 Report Service Issue
Official FAQ for reporting service issues during business hours and after hours.
Open Service Issue FAQ🏛️ County DOW Page
County of Kauaʻi Department of Water directory page.
Open County DOW Page🧾 Kauaʻi Sewer Payments
Separate County sewer payment route through Hawaii.gov online services.
Open Sewer PaymentFAQs About Kauai County Water Department Bill Pay
How do I pay my Kauaʻi water bill online?
Use the official Kauaʻi Department of Water Pay Your Water Bill page and the Koʻu Wai Customer Account Portal. Use account information exactly as shown on your bill statement.
What is the Kauai Department of Water phone number?
The official main phone number is 808-245-5400.
Where is the Kauai Department of Water office?
The office is located at 4398 Pua Loke Street, Līhuʻe, Hawaiʻi 96766.
What are Kauai Department of Water office hours?
Office hours are Monday through Friday, 7:45 a.m. to 4:30 p.m. Lobby hours are 8:00 a.m. to 4:00 p.m.
What is the Kauai water emergency number?
For water emergencies during business hours, call 808-245-5444. For nights and weekends, call 808-241-1711.
Can I use a drop box for my Kauaʻi water bill?
Yes. The Department of Water pay page says the parking-lot drop box is available Monday through Friday from 6:00 a.m. to 4:30 p.m., excluding holidays, and is not accessible outside those hours.
Who do I call for a Kauaʻi water service issue?
During business hours, call 808-245-5444. After hours, call Police dispatch at 808-241-1711, and they will contact the standby crew.
Are Kauaʻi water and sewer bills the same?
No. The Department of Water handles water bills. County sewer payments are separate and are handled through the County of Kauaʻi Division of Wastewater Management payment service.
Where can I find Kauai Department of Water forms?
Use the official Applications and Forms page on kauaiwater.org. The page says most forms are interactive and can be completed online, then printed and submitted by mail, fax or in person.
Is this the official Kauaʻi Department of Water website?
No. This is an independent informational guide. Use the official Kauaʻi Department of Water links in this article before entering payment or account details.
Best Way to Pay Kauai County Water Department Bill in 2026
The best normal payment route is the official Kauaʻi Department of Water Pay Your Water Bill page, which connects customers to the Koʻu Wai Customer Account Portal.
For customer service, call 808-245-5400. For water emergencies during business hours, call 808-245-5444. For nights and weekends, call 808-241-1711. For in-person help, visit 4398 Pua Loke Street, Līhuʻe, HI 96766 during lobby hours.
Important Notice: This article is an independent informational guide and is not the County of Kauaʻi, Kauaʻi Department of Water, Koʻu Wai Customer Account Portal, Hawaii.gov, or a payment processor. Payment links, phone numbers, office hours, drop box access, emergency routing, rates, forms and service rules can change. Always verify urgent or official matters directly with the Kauaʻi Department of Water before acting.