Residential ADUs
District Policy for Residential Accessory Dwelling Units (ADU)
Water and Sewer Policy for ADUs
The following information summarizes Coal Creek Utility District Resolution# 1875 regarding homeowners with Attached or Detached Accessory Dwelling Units (ADUs) in our service area, including Newcastle, Washington.
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These ADU Water and Sewer Policies apply only to single-family residential properties. Multi-family, commercial, and public-institutional properties must have separate meters and connections for each structure.
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Additional details are provided in our FAQs; if you aren't able to find the answer you need, feel free to contact us by phone or email.
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​​ADUs can share a single water meter and sewer connection for both the main residence and the ADU.
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A minimum 1-inch water meter is required.
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ADUs must also meet both local land use regulations and cross-connection control policies.
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Permit fees are as follows:
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$300 for a side sewer permit (ADU connection inspection).
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$300 if a grinder pump is used (covers additional inspection and admin costs).
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Billing is as follows:
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Attached ADUs are billed like a duplex.
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Detached ADUs are billed as two separate single-family residences.
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Water usage is billed at the 1-inch meter base rate (or higher if a larger meter is required).
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If you subdivide your property, each new parcel must install its own water meter and sewer connection, and pay all related fees.
