County of Kauai Water Department 2026: Bill Pay, Login & Customer Service
Kauaʻi water customers usually need a practical answer fast: how to log in to Koʻu Wai, why phone payments are not accepted, which payment routes add fees, where the Pua Loke Street drop box is, how to start or transfer service, what documents tenants need, who to call for low pressure or a broken meter, and whether an underground leak can qualify for an adjustment. This guide turns the official Kauaʻi Department of Water pages into a scan-first action hub with payment rules, office hours, emergency contacts, forms, rates and service steps in one place.
Choose the Kauaʻi Water Task You Need Right Now
Kauaʻi Department of Water Contacts Users Actually Need
| Need | Official detail | Use this for |
|---|---|---|
| General DOW phone | 808-245-5400 | General Department of Water questions and routing. |
| Billing Services | 808-245-5442; 808-245-5400 option 2; billing@kauaiwater.org | Water bill, payment, account, service setup, transfers, ABP and missing bill questions. |
| Business-hour emergency / operations | 808-245-5444; or 808-245-5400 option 1 | Water emergency, low pressure, service issue, meter damage or operations problem during business hours. |
| After-hours emergency | Police Dispatch: 808-241-1711 | Nights, weekends and holidays; dispatch contacts DOW standby crew. |
| Office address | 4398 Pua Loke Street, Līhuʻe, HI 96766 | Lobby payment, drop box, mail, forms and in-person service. |
| Operating hours | Monday-Friday, 7:45 AM-4:30 PM | Phone or appointment timing. |
| Lobby hours | 8:00 AM-4:00 PM | In-person service windows and payment visits. |
| Water quality | 808-245-5400 option 3 | Water quality, environmental and drinking water regulation questions. |
| Water planning / permitting | 808-245-5400 option 4; wrp@kauaiwater.org | Water planning, permitting and water clearance questions. |
| Project management | 808-245-5400 option 6; pm@kauaiwater.org | Design, construction plan review and inspection questions. |
Koʻu Wai Customer Account Portal Login and Registration
Koʻu Wai is the Kauaʻi Department of Water Customer Account Portal. Use it for online bill payment and account access. The registration page says to register with the primary account holder’s information as shown at the top right of the water statement.
How to Pay a Kauaʻi Water Bill Online
Open the official payment page
Start from the official Pay Your Water Bill page.
Use Koʻu Wai for online payment
Click the online payment link or go directly to the Koʻu Wai Customer Account Portal.
Check the fee before submitting
DOW lists online debit/credit card payment with a 2.9% + $0.30 transaction fee.
Save proof
Save the confirmation number, date, amount, account number and receipt until the payment posts.
Kauaʻi Water Bill Payment Options
| Payment method | Official detail | Best use |
|---|---|---|
| Online | Koʻu Wai Customer Account Portal; debit or credit card; 2.9% + $0.30 transaction fee. | Fast payment when you accept the fee. |
| In person | Main lobby service windows, Monday-Friday 8:00 AM-4:00 PM except holidays; cash, check or money order accepted. | Cash payment or in-person billing help. |
| Parking lot drop box | 4398 Pua Loke Street, Monday-Friday 6:00 AM-4:30 PM; check or money order only; no cash. | Local drop-off during accessible hours. |
| Department of Water, County of Kauaʻi, 4398 Pua Loke Street, Līhuʻe, HI 96766; check or money order only. | Non-urgent payments. | |
| Līhuʻe Walmart | Walmart Customer Service desk; must show ID and be the account holder; $1.99 transaction fee. | After-office-hours walk-in option if Walmart is open. |
| Meter reader | DOW says meter readers do not accept bill payments. | Never hand payment to a meter reader. |
Automatic Bill Payment: Bank Draft vs Portal Card Autopay
DOW Automatic Bill Payment
To set up ABP, complete the Automatic Bill Payment Authorization form and submit it with a voided blank check to DOW in person, by email or by postal mail.
Stop ABP
To stop automatic payment, contact DOW at 808-245-5442 or billing@kauaiwater.org.
Start, Stop or Transfer Kauaʻi Water Service
| Service situation | Official detail | User action |
|---|---|---|
| Property already has meter service box | Use the Application for Water Service. | Complete application and submit required documents. |
| No water meter service box | Submit Water Clearance Form first, residential or non-residential. | Contact DOW option 4 if unsure whether a meter box exists. |
| Homeowner | Include valid photo ID and proof of property ownership signed and dated. | Attach ownership documents before sending. |
| Renter / tenant | Include notarized rental agreement signed by owner or notarized authorization letter plus $210 refundable deposit by cash or check. | Notarize documents to avoid processing delay. |
| Submit remotely | Applications can be sent by email or postal mail; office visit is not required to turn on, stop or transfer service. | Email billing@kauaiwater.org or mail to 4398 Pua Loke Street. |
| Timing | One business day notice is required if all documents are received before 3 PM; Friday requests start following Monday, or Tuesday if Monday is a holiday. | Submit earlier than move-in day. |
| Move out / cancel service | DOW says you should cancel service so billing and account contact information can be transferred properly. | Do not leave service active for the next occupant. |
Kauaʻi Department of Water Forms: Which One Do You Need?
| Form | Use it when | Where / contact |
|---|---|---|
| Application for Water Service | Property already has an existing water meter box. | billing@kauaiwater.org |
| Application for Temporary Water Service | You need temporary fire hydrant use. | billing@kauaiwater.org |
| Payment Plan / Promissory Note | You need to arrange payments on a high or past-due water bill. | billing@kauaiwater.org |
| Automatic Bill Payment Authorization | You want your water bill automatically deducted from a bank account. | billing@kauaiwater.org |
| Leak Adjustment Request | You are requesting review for an undetected underground leak. | In person only; notary required. |
| Agricultural Application | You need new or renewal agricultural rate water service. | billing@kauaiwater.org |
| Water Clearance Form – Residential | Residential property does not yet have a water meter service connection. | wrp@kauaiwater.org |
| Water Clearance Form – Non-residential | Non-residential property needs a new water meter service connection. | wrp@kauaiwater.org |
| Fire Hydrant Flow Test | You need a fire hydrant flow test application. | wrp@kauaiwater.org |
| Backflow Prevention Assembly Test Report | A backflow test report is needed from certified testers. | wrp@kauaiwater.org |
Kauaʻi Leak Adjustment: Rules That Matter Before You Apply
The leak adjustment form is strict. It is not a general “high bill discount.” It applies to undetected underground leaks and requires complete documentation.
| Requirement | Official rule summarized | What to do |
|---|---|---|
| Complete form | The form must be filled out entirely; incomplete requests will not be considered. | Check every field before submitting. |
| Notarized affidavit | Original signed and notarized affidavit is required. | Use a Notary Public; copies of notarized affidavit are not acceptable. |
| Repair deadline | Customer must repair and stop the leak within one week after knowing or having reason to know of the leak. | Call DOW quickly after a high bill or leak notice and repair fast. |
| Underground leak only | Above-ground fixtures are not allowed, including toilet leaks, sprinkler heads and above-ground irrigation systems. | Do not submit toilet/sprinkler-head leaks as underground leak adjustments. |
| Keep paying | Customer must continue making monthly payments while the bill is investigated; late fees may apply. | Ask about a payment plan if the high bill is not affordable. |
| Frequency limit | Adjustments are granted only once every two years; services under 12 months are determined by the Manager. | Make sure your request is complete the first time. |
| Proof | Provide before/after pictures, repair bill or invoice, parts receipts and detailed repair explanation. | Collect proof before submitting. |
Report Low Pressure, Damaged Meter, Outage or Water Service Problem
During business hours
Call Operations at 808-245-5444 or DOW at 808-245-5400 option 1.
Nights, weekends, holidays
Call Police Dispatch at 808-241-1711. Dispatch contacts the standby water crew.
| Issue | Likely route | Have ready |
|---|---|---|
| Someone ran over meter | Call Operations at 808-245-5444. | Address, cross street, visible water flow, photos if safe. |
| Low pressure | Call Operations; issue may be property leak, PRV failure or County line problem. | Whether neighbors also have pressure loss, recent plumbing work, leak signs. |
| Air / cloudy water | Let water sit in a glass; if it clears from bottom up, air is likely cause. | Time noticed, whether all fixtures affected, if recent outage/repair nearby. |
| Service outage | Check official service outages and emergency notices. | Community/location, address, time service stopped. |
Kauaʻi Water Rates and Charges: What Your Bill Includes
DOW says rates are based on water usage per 1,000 gallons, multiplied by the corresponding tier block. Customers are also charged a fixed monthly service charge and a power adjustment charge.
| Charge type | Official detail | Why it matters |
|---|---|---|
| Usage charge | Charged per 1,000 gallons by tier block. | Higher use can move into higher tier blocks. |
| Monthly service charge | Fixed monthly charge based on meter size. | You may owe this even with low or similar usage. |
| Power adjustment charge | Added to monthly water bill. | This can change total bill beyond water use alone. |
| Common meter reference | DOW says 5/8-inch is a good rule-of-thumb if you do not know meter size. | Most residential users may start there when reading rate tables. |
| General-use example | Effective 7/1/14 amount shown | Note |
|---|---|---|
| 5/8-inch monthly service charge | $17.75 | Most common meter-size rule-of-thumb. |
| 3/4-inch monthly service charge | $24.75 | Check your bill under Current Activity for meter size. |
| 1-inch monthly service charge | $36.50 | Larger meters carry higher monthly service charges. |
| 0th block use charge | $3.80 per 1,000 gallons | Use charge tiers vary by meter size and block threshold. |
| 1st block use charge | $4.85 per 1,000 gallons | Use official table for exact tier. |
| 2nd block use charge | $5.65 per 1,000 gallons | Higher use may fall into higher tiers. |
| 3rd block use charge | $9.50 per 1,000 gallons | High usage can raise bill quickly. |
| 4th block use charge | $10.00 per 1,000 gallons | Highest listed general-use block in the table. |
Temporary Water Service, Hydrant Use and Fire Flow Forms
Kauaʻi DOW forms include temporary water service, fire hydrant flow test and related engineering forms. Use the correct form before using hydrants, requesting fire-flow data or planning construction water.
| Need | Official route | Contact |
|---|---|---|
| Temporary fire hydrant use | Application for Temporary Water Service. | billing@kauaiwater.org |
| Fire hydrant flow test | Fire Hydrant Flow Test application. | wrp@kauaiwater.org |
| Backflow prevention assembly | Backflow Prevention Assembly Test Report. | wrp@kauaiwater.org |
| Construction plan review | Project Management Division. | pm@kauaiwater.org; 808-245-5400 option 6 |
Water Quality, Outages and Emergency Notices
Water quality questions
For water quality, environmental or drinking water regulation questions, use 808-245-5400 option 3.
Outage notices
Check official DOW service outages and emergency notices before assuming the problem is only on your property.
What to Say When Calling Kauaʻi Department of Water
| Situation | Say this | Have ready |
|---|---|---|
| Portal login problem | “I need help with my Koʻu Wai Customer Account Portal login or registration.” | Account holder name exactly as shown on bill, account number, service address, email. |
| Missing bill | “I did not receive my water bill when expected and need to confirm my mailing address.” | Account number, service address, mailing address and phone/email. |
| Start / transfer service | “I need to start, stop or transfer water service for this property.” | Photo ID, ownership proof or notarized rental/authorization documents, move date, service address. |
| Tenant service | “I am a tenant applying for water service and need to confirm deposit and notarized document requirements.” | Notarized lease or owner authorization, $210 deposit by cash/check, photo ID. |
| High bill / underground leak | “I have a high bill and possible underground leak. I need leak adjustment and payment plan guidance.” | Bill dates, repair date, photos, repair invoice, parts receipts, affidavit plan. |
| Low pressure or damaged meter | “I am reporting low water pressure / damaged meter at this address.” | Exact address, whether neighbors are affected, photos, water flow or hazard details. |
| After-hours emergency | “I need DOW standby crew contacted for a water emergency.” | Address, cross street, type of emergency, active leak or no-water details. |
Kauaʻi Department of Water Map and Visit Checklist
Department of Water, County of Kauaʻi
Address: 4398 Pua Loke Street, Līhuʻe, HI 96766.
General phone: 808-245-5400.
Lobby hours: 8:00 AM-4:00 PM, Monday-Friday except holidays.
Official Kauaʻi Department of Water Links
Department of Water Home
Main DOW site with notices, payment, service, rates, quality and department resources.
Open DOW SitePay Your Water Bill
Payment options, fees, drop box, mail, Walmart and ABP instructions.
Open Payment PageKoʻu Wai Login
Customer Account Portal for online account access and online bill payment.
Open PortalSign Up or Transfer Service
Start, stop or transfer water service, documents, deposit and timing rules.
Open Service PageApplications and Forms
Water service, temporary water, ABP, payment plan, leak adjustment, agricultural and engineering forms.
Open FormsRates and Charges
Monthly service charges, use charges, fire service, temporary water, power adjustment and late charges.
Open RatesContact Us
General phone, emergency phone, billing, water quality, engineering and department emails.
Open Contact PageCounty Department Page
County of Kauaʻi Department of Water location, phone, email and department head information.
Open County PageCounty of Kauai Water Department Bill Pay, Login and Customer Service FAQs
How do I pay my Kauaʻi water bill online?
Use the official Koʻu Wai Customer Account Portal linked from Kauaʻi Department of Water’s Pay Your Water Bill page. Online debit or credit card payments carry a 2.9% plus $0.30 transaction fee.
Does Kauaʻi DOW accept payment by phone?
No. The Pay Your Water Bill page says the Department of Water is unable to accept payments over the phone.
What is the Kauaʻi DOW billing phone number?
Billing Services is listed at 808-245-5442 or 808-245-5400 option 2. The billing email is billing@kauaiwater.org.
Where is the Kauaʻi Department of Water office?
The Department of Water office is at 4398 Pua Loke Street, Līhuʻe, HI 96766.
What are the lobby hours?
The Contact Us page lists hours of operation Monday-Friday, 7:45 AM to 4:30 PM, and lobby hours 8:00 AM to 4:00 PM.
What number do I call for a water emergency?
During business hours, call 808-245-5444 or 808-245-5400 option 1. For nights, weekends and holidays, call Police Dispatch at 808-241-1711.
Can I pay at the Līhuʻe Walmart?
Yes. DOW says walk-in payments are accepted at the Līhuʻe Walmart Customer Service desk during Walmart business hours. You must show ID and be the account holder. A $1.99 transaction fee applies.
Can someone else pay my account?
DOW says yes if they have your account number, a copy of your bill or physical address to identify the correct billing account. The exception is Walmart, where you must be the account holder.
How do I start water service in Kauaʻi?
If the property already has a water meter service box, use the Application for Water Service. If there is no meter service box, submit the residential or non-residential Water Clearance Form first.
What documents do tenants need for water service?
Tenants need a valid photo ID and either a notarized rental agreement signed by the property owner or a notarized authorization letter, plus a $210 refundable deposit by cash or check.
How much notice is needed to start service?
DOW says one business day notice is required if complete documents are received before 3 PM. Friday requests are not accommodated until the following Monday, or Tuesday if Monday is a holiday.
How do I get a leak adjustment?
Use the Leak Adjustment Request form for undetected underground leaks only. It must be complete, include an original notarized affidavit, and include repair documentation such as pictures, invoices and parts receipts. Customers must keep paying monthly bills during review.
Are toilet leaks or above-ground sprinkler leaks eligible?
No. The leak adjustment instructions exclude above-ground fixtures, including toilet leaks, toilet flaps, sprinkler heads, above-ground irrigation systems and exposed waterlines within the premises.
How often can an adjustment be granted?
The leak adjustment instructions say approved adjustments are granted only once every two years. Adjustments on services less than 12 months are determined by the Manager.
Best Way to Use the County of Kauai Water Department Page
This page is built for Kauaʻi customers who want direct answers, not filler. Every section above gives the official phone number, portal, payment method, form, fee, document requirement, emergency route, rate clue or next step needed to solve a water bill or service problem.
Editorial note: This independent guide summarizes official Kauaʻi Department of Water and County of Kauaʻi resources for easier public use. Payment fees, portal notices, lobby hours, drop box access, forms, deposits, service timing, rates, emergency procedures and leak adjustment rules can change. Confirm final details on official kauaiwater.org, kauaiwater.kouwai.org or kauai.gov pages before paying, submitting documents, requesting service, relying on rates or applying for an adjustment.