Community Services

CTMRD Boundaries, Benefit Groups, & Remediation Fees

Every year there are public hearings are held before the Board of County Commissioners to discuss the adoption of an ordinance imposing a fee on the parcels of land in Washoe County, Nevada District No. 24 (Groundwater Remediation) to pay the costs of developing and carrying out a remediation plan; and other matters relating thereto. The Board is required to amend the Central Truckee Meadows Remediation District (CTMRD) boundaries when necessary.  CTMRD boundaries include both a Service Area Boundary and a Contaminant Boundary.  In addition, the estimated number of parcels and average annual per parcel remediation fee by benefit group, and the total annual remediation fee revenue that would result from the adoption of these ordinances are also presented at this time.

To review the documents submitted by the CTMRD staff during these meetings, please click the link below.


Map of the parcels in within the CTMRD service area, delineated by water purveyors.The Central Truckee Meadows Remediation District (CTMRD) includes two significant geographic boundaries. The Contaminant Boundary includes those areas where PCE-contaminated groundwater currently exists, or where that contaminated groundwater is expected to migrate if it is not controlled or contained. The Service Area Boundary includes the parcels that are served by water purveyors with water supply wells located inside the Contaminant Boundary.  Water purveyors with wells inside the Contaminant Boundary presently include Washoe County's water utility, Truckee Meadows Water Authority, the Sun Valley General Improvement District, and the Parr-Reno Water Company. These boundaries are subject to annual updates.

The Service Area boundary has been updated annually since 1999; the Service Area boundary changes as parcels are added to (for example, as during development) or removed from the service areas of municipal water providers.

Map of the CTMRD service area and the CTMRD contaminant boundary.The Contaminant Boundary was first delineated in 2001. This delineation was based on investigations to date and indicated that PCE contamination in the central Truckee Meadows extended over more than 16 square miles. Work conducted since 2001 as part of the CTMRD program led to the first Contaminant Boundary update in 2011. More than 5,000 parcels were removed from the Contaminant Boundary at that time, reducing the area inside the Contaminant Boundary to 9.5 square miles. The Contaminant Boundary changes reflect progress made in better defining the nature and extent of the PCE problem. PCE contamination in the central Truckee Meadows attributable to historical activities is not as extensive as it was in 2001. In 2014, the CTMRD Contaminant Boundary was again reduced by approximately 285 parcels (one square mile). The 2014 changes were related to removal of parcels either no longer affected by underlying PCE contamination or considered to be affected by contamination from a recognized corrective action site where a responsible party has been identified by NDEP. The CTMRD Contaminant Boundary was updated for the 2022 remediation billing year.

Close-up map the the CTMRD contaminant boundary

Please visit our Downloadable Maps & Reports page for current and past CTMRD boundary maps. Contact the Washoe County Clerk's Office to review the list of parcels included in the CTMRD boundaries that are filed there each year. 


While the CTMRD program provides benefits for all water users in Southern Washoe County served (on an either resale or wholesale basis) by purveyors with wells in the PCE-affected area and for property owners in the central Truckee Meadows where the PCE condition exists, the benefits received by each group are distinct.

While the CTMRD program provides benefits for water users in southern Washoe County, three distinct benefit groups are defined based on the CTMRD boundaries:

  • Benefit Group A: all water users within the Service Area Boundary;
  • Benefit Group B: owners of residential property located inside the Contaminant Boundary; and,
  • Benefit Group C: owners of non-residential property located inside the Contaminant Boundary.

Those in Benefit Group A benefit from ongoing access to a safe and sustainable water supply. In addition to the benefit of a safe and sustainable water supply, Benefit Group B benefits from ongoing CTMRD program activities to mitigate PCE-contaminated soils and groundwater underlying their properties. This results in protection of property values by avoiding designation of the central Truckee Meadows as a federal Superfund site. Benefit Group C also benefits from limited individual liability for the PCE contamination that is provided by the creation of the CTMRD. Non-residential and residential properties are typically subject to distinct processes during transfer of ownership. Typically, lenders require that non-residential (that is, commercial) property transactions include due diligence assessments of environmental conditions.  Residential property transactions typically are not subject to environmental due diligence.

Map of the Water users benefit groups. Groups within the contaminant boundary (red area) are Groups B and C. The area outside this boundary but within the service area (yellow) is Group A.

 The Remediation Fee

Nevada Revised Statutes (NRS) 540A.250-285 authorizes the Board of County Commissioners to support the cost of developing and implementing the CTMRD plan for remediation by collecting a fee. This fee is assessed annually on parcels of land located within the CTMRD boundaries. Statute requires that the fee be based on the annualized water usage on each individual parcel. Specifically, NRS 540A.265 stipulates that a tiered fee rate structure can be imposed to reflect varying levels of benefit derived from the creation and implementation of the CTMRD. Therefore, a three-tiered fee rate structure has been created to reflect the three benefit groups described above. The actual rate is determined on an annual basis. All water using properties located inside the Service Area Boundary but outside the Contaminant Boundary pay a base fee rate with a 1x multiplier. Residential parcels within the Contaminant Boundary pay a fee rate with a 2x multiplier and non-residential parcels inside the Contaminant Boundary pay a fee rate with a 4x multiplier (to reflect the progressively greater benefits received).

The Remediation Fee is included on your annual general tax bill (see example below). The remediation fee for water use during the previous calendar year is included on the general tax bills sent out by the County Treasurer each July. The remediation fee assessed is identified as the line item called "Remediation."

Washoe County Property Tax Bill         Rates and Amounts may vary by year and property.

The CTMRD Remediation Fee is based on water usage determined by your water provider, (Truckee Meadows Water Authority, the Sun Valley General Improvement District, or the Parr-Reno Water Company (775-324-0561). For questions regarding the remediation amount shown on your Washoe County property tax bill, please contact your water purveyor.  For additional information regarding the Remediation Fee billing process, please contact Bonnie Weller, CTMRD Technology Systems Developer II, by email or at (775) 954-4633. For all other questions, please call Washoe311 so they may direct your call to the appropriate personnel.

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Call 311 to find resources, ask questions, and utilize Washoe County services. Learn More »