Your Water Services Department works hard to provide customers with safe, high-quality drinking water and outstanding wastewater treatment services. This effort begins at the water source and continues throughout the water distribution and wastewater treatment processes.
Water Services Ordinance
If you have ever wondered where your water comes from, or what is in your drinking water, you will find the answer to these and more questions in the annual Drinking Water Quality Report (also known as the Consumer Confidence Report). Public water suppliers must provide these reports to their water customers each year by July 1, as required by the 1996 amendments to the Safe Drinking Water Act (SDWA).
Wastewater Treatment and Compliance
Wastewater / Sewer Ordinance
The City of Caldwell has one wastewater treatment plant to treat all of the sludge in our community’s wastewater.
Activated sludge treatment is an aerobic (oxygen dependent) process that uses millions of microorganisms to remove waste materials from the water. There are two basic stages in the treatment of wastewater: the primary stage, in which most solids are removed, and the secondary stage, which removes organic materials and nutrients.
Approximately 60 percent of all solids and organic materials are removed from the wastewater during the initial stage known as primary treatment. As wastewater enters the treatment plant, it flows through a screen to remove large floating objects, such as rags and sticks, which might clog pipes or damage equipment. After the wastewater has been screened, heavier solids are allowed to settle to the bottom of a clarifier and are removed by submerged pumps. The heavier removed solids are combined to form sludge. Lighter solids, such as grease and scum, float to the surface and are skimmed off and placed in a container called a scum box.
With the help of microorganisms, secondary treatment removes about 95% of the organic matter from wastewater. This process begins with water flowing into an aeration basin where induced air keeps the microorganisms and food source in contact. Solids are even further removed from the water through a settling process similar to that used in primary treatment.
During the final stage, known as disinfection or final treatment, chlorine is added to the water to kill any remaining pathogenic bacteria and to reduce odor. Excess chlorine is then removed by adding sulfur dioxide, making the water safe for fish and receiving water bodies. Alternatively, UV (ultraviolet) light can be used in place of chlorine gas and sulfur dioxide gas to achieve disinfection. The clean, safe and treated water is then discharged into the environment. The quality of the water released from the treatment plants is actually cleaner than the existing water in the area creeks.
Sludge and scum removed during the treatment process is further reduced through the process of anaerobic digestion. Mimicking the stomach’s digestion process, naturally occurring microorganisms work to break down sludge and scum into biosolids. Excess water is removed from the biosolids, or treated sludge, by a belt press or gravity filter and are eventually sent to the BVSWMA Compost Facility to produce high quality compost.
Water Rates (Effective October 15, 2019)
The rates to be charged customers inside and outside the city limits for water furnished through an individual meter by the water system of the city are hereby set as follows:
|Water Meter Usage
|Minimum including 0-2000 (per M)
Surcharge for conservation district fees:
Master meters. Each location metered through a master meter shall have a minimum charge assigned to each occupied space each month with the cumulative gallons allowed therewith as covered by such charges. All gallons above the accumulative base minimums will be billed at $2.56 per thousand inside the city and $3.87 per thousand outside the city.
Water production fees are being assessed by the Post Oak Savannah Groundwater Conservation District for water produced by city water wells. A surcharge will be levied per one thousand (1,000) gallons of water flowing through each customer meter for these conservation district production fees. Said surcharge will appear as a separate line item on the monthly water bill.
The following specifies the charges for tapping of water main, extension of services from main to property line location of meter, and installation of meter, provided said distance does not exceed fifty (50) feet (Tap services requiring distances greater than fifty (50) feet and all taps above 1″ diameter will be at actual costs (labor and material)):
|Water Tap Service Size
Charge for obtaining water through fire hydrant:
The rate to be charged customers obtaining water through a fire hydrant meter shall be billed at a flat charge of $4.25 per 1,000 gallons used. There will be a minimum charge of $20.00.
Sewer Rates (Effective October 15, 2019)
The rates to be charged customers inside and outside the city limits for sewer based on water metered through an individual meter by the water system of the city are hereby set as follows for
|Residential Metered Sewer Usage
|Minimum including 0-2000 (perM)
Charges for the months of December, January and February are based on actual usage for each respective month. The months of March through November are at a fixed charge based on the average monthly water usage for the combined months of December, January and February. A new customer’s rate shall be established by all customers in that rate class in the most recent indexing period (December, January and February) until that customer has been individually experience-rated in the next December-January-February period.
|Commercial Metered Sewer Usage
|Minimum including 0 – 2,000 gallons
|Over 2,000 gallons
Each location metered through a master water meter shall have the minimum sewer charge assigned to each occupied space each month with the cumulative gallons allowed therewith as covered by such charges. All gallons above the accumulative base minimums will be billed at the scheduled rates.
The following specifies the charges for tapping of sewer main and extension of service for a distance not to exceed fifty (50) feet (Tap services requiring distances greater than fifty (50) feet will be at actual costs (labor and material)):
|Sewer Tap Service Size
Surcharge for excessive strength waste:
If it is determined by the city administrator and/or the superintendent of the sewer department, or their delegated authority, that an individual or an industry is discharging to the sewer collection and/or treatment systems biochemical oxygen demand and/or total suspended solids outside of prescribed and approved limits, then a sample will be taken of the discharge and a special surcharge will be determined. Acceptable guidelines are set out in division 3 of this article and in appropriate state and federal laws. The most restrictive criteria will always be followed.