Here you will find information about the District’s facilities, important usage tips for property owners, levee and ditch regulations and a typical pre-flood season homeowner’s notice.
Sanitary Sewer Facility – Overview
The main purpose of the NRRD is to operate and maintain a sanitary sewer treatment facility that serves approximately 148 properties on Milton Road. Our system is a S.T.E.P. (Septic Tank Effluent Pump) facility that consists of 15 stations along the road and a treatment facility at 1501 Milton Road. Basically a modified septic tank system.
Collection System: Waste flows by gravity from each house to one of 15 S.T.E.P.
stations located along the west side of Milton Road. The S.T.E.P. station consists of a distribution box, a primary tank, a pump chamber and a control box. Waste flows to the tank/pump chamber. The controls sense when the pump chamber is full and turns on the 1 HP submersible pump. The liquid waste (called effluent) is pumped up the road and into the treatment plant.
Treatment Plant: The treatment plant consists of a dosing siphon, an 8 acre mound system, a pump chamber and 3 acres of evaporation ponds. Effluent enters the dosing siphon and when full the siphon empties the waste into the mound system. The waste is treated by aerobic bacteria in the mound soil. Effluent percolates through the soil into under-drains flows to the mound pump chamber. When the pump chamber is full the effluent is pumped into one of three evaporation ponds.
To Keep Our System Working Properly
DO NOT Plumb your roof drains into your sewer lateral. This puts literally thousands of gallons into the system which it cannot handle.
DO NOT open your cleanout to drain your yard.
DO NOT flush anything that you have not eaten (except toilet paper). Kleenex, paper towels, and baby wipes are not designed to dissolve.
DO NOT put feminine hygiene products or condoms down the toilet. These items clog the screens that protect the pumps causing the system to fail which costs you money.
DO NOT put human or pet hair into the system. Again, these will clog the screens.
DO NOT over use your garbage disposer. Septic systems are designed to treat “pre-digested” material. Raw vegetables are not pre-digested and are best put in the yard waste.
PLEASE fix leaking toilets and bypassing water softeners. They waste thousands of gallons of precious water which passes into a system that cannot handle it.
Each property owner within the district owns their levee and has the responsibility for using reasonable care to maintain his portion of the levee. If an owner negligently fails to maintain his levee and as a result of that negligence flooding and damage is caused to his neighbors, then that negligent property owner can be held liable for the damages resulting to his neighbors.
After flooding twice in 1983 the district hired an engineer to address the flooding problems. The conclusion was that the levees should be at least ten (10) feet high and could typically be constructed of one of the following: impervious dirt fill, sheet pile, concrete flood wall with a J footing or reinforced concrete block. It should also be tied in with the adjacent property to form a contiguous barrier. Each individual levee is site specific so therefore a professional engineer with levee experience should be consulted.
The levees were surveyed again in 2009. The results of the survey may be viewed here: 2009 Levee Survey with Summary. Property owners could use this information to determine the height of their levee. See the diagram below for a visual explanation of levee height.
Roadside Ditches and Flood Control
It is the responsibility of each property owner to maintain the drainage ditch on the east side of Milton Road which is on their property. You must place and maintain a culvert if the ditch is covered. Water must be able to flow to the cross-over drains that are approximately every 150 to 200 feet along the road. These drains allow surface water to flow to the large drainage ditch on the west side of Milton Road. Water in this ditch flows to the dewatering pump station and pumped out if necessary. This ditch must remain clear of debris in order for the water to flow properly. Please do not put anything in, or allow items to fall into the ditch that may cause the ditches to clog or cause damage to the pumps (i.e. yard waste, wood, tires, etc.). If you see debris in the ditch please remove it or call the district for assistance.
The District operates and maintains 3 dewatering pumps which are used to pump out rain/flood water on Edgerly Island (south of the railroad tracks). The pumps are located in a pump house at 1814 Milton Road.
Napa County Flood Control operates the flood gate which is used to remove flood water from the Ingersol Track (north of the railroad tracks). The flood gate is located at 1300 Milton Road.
Typical Pre-flood Season Notice To Homeowners
The following is a typical notice to homeowner which is sent out before the winter rainy season:
NAPA RIVER RECLAMATION DISTRICT #2109
1501 MILTON ROAD
NAPA, CA 94559
WINTER IS APPROACHING….…..BE PREPARED
The Napa River Reclamation District would like to remind the property owners/residents of the District (1202 Milton Road to 1998 Milton Road) of the following:
1. Levee Maintenance: It is the responsibility of each property owner to maintain the levee on their property. The District recommends a 10 foot high water tight levee. This levee is to be continuous with the neighboring levees.
2. Levee Access: In time of emergency, it is important that the District/County has access to the levee. Each property owner needs an 8 foot wide access to the levee. Building upon the levee is discouraged as it interferes with emergency inspections and repairs.
3. Sewer Operations During Flooding or a Power Outage: If water covers any part of Milton Road or the area loses electrical power, the sewer system may shut down without notice. When the system is down please do not flush toilets or use drains.
4. Sewer Cleanouts: The cleanouts on your property to the sewer system must be air and water tight in order to keep ground water from flooding the system and to control odors. Please insure that your roof and yard drains are NOT hooked up to the sewer system. Please make sure the cleanouts are closed properly.
Drainage Ditches: Please do not put anything in the big roadside ditch. The ditch is drained by pumping and any debris in the ditch can ruin the pump causing the road to flood. Please keep the drainage on your property in good condition so storm water can get to the ditch easily.
Sand & Sandbags: In the event of flooding, sand and sandbags will be available at the district office, 1501 Milton Road. Be prepared to fill and haul your own bags.
If you have any questions or suggestions the District Board meets at 7 PM on the first Thursday of each month at the Fire House. These meetings are open to the public. You may also leave a message at the District office by calling 707-255-2996 or email