Private Water Wells

If your  family gets drinking water from a private well, do you know if your water is  safe to drink? What health risks could you and your family face? Where can you  go for help or advice? The EPA regulates public water systems; it does not have  the authority to regulate private drinking water wells. Approximately 15% of  Americans rely on their own private drinking water supplies, and these supplies  are not subject to EPA standards, although some state and local governments do  set rules to protect users of these wells. Unlike public drinking waterprivatewellpic
systems serving many people, they do not have experts  regularly checking the water’s source and its quality before it is sent to the  tap. These households must take special precautions to ensure the protection and  maintenance of their drinking water supplies.

 

Basic Information

 

There are three types of private drinking water wells: dug,  driven, and drilled. Proper well construction  and continued maintenance are keys to the safety of your water supply. Your  state water-well contractor licensing agency, local health department, or local  water system professional can provide information on well  construction.The well should be located so rainwater flows away from it.  Rainwater can pick up harmful bacteria and chemicals on the land’s surface. If  this water pools near your well, it can seep into it, potentially causing health  problems.Water-well drillers and pump-well installers are listed in your  local phone directory. The contractor should be bonded and insured. Make certain  your ground water contractor is registered or licensed in your state, if  required. If your state does not have a licensing/registration program, contact  the National Ground Water Association.

To keep your well safe, you must be sure that possible sources  of contamination are not close by. Experts suggest the following distances as a  minimum for protection — farther is better (see graphic  on the right):

  • septic tanks:  50 feet;
  • livestock yards, silos, septic leach fields:  50  feet;
  • petroleum tanks, liquid-tight manure storage and fertilizer  storage and handling:  100 feet; and
  • manure stacks:  250 feet.

Many homeowners tend to forget the value of good maintenance  until problems reach crisis-levels. That can be expensive. It’s better to  maintain your well, find problems early, and correct them to protect your well’s  performance. Keep up-to-date records of well installation and repairs, plus  pumping and water tests. Such records can help spot changes and possible  problems with your water system. If you have problems, ask a local expert to  check your well construction and maintenance records. He or she can see if your  system is okay or needs work.

Protect your own well area. Be careful about storage and  disposal of household and lawn-care chemicals and wastes. Good farmers and  gardeners minimize the use of fertilizers and pesticides. Take steps to reduce  erosion and prevent surface water runoff. Regularly check underground storage  tanks that hold home heating oil, diesel, or gasoline. Make sure your well is  protected from the wastes of livestock, pets and  wildlife.

 

 

Dug Wells

 

Dug wells are holes in the ground dug by shovel or backhoe.  Historically, a dug well was excavated below the ground water table until  incoming water exceeded the digger’s bailing rate. The well was then lined  (cased) with stones, brick, tile, or other material to prevent collapse. It was  covered with a cap of wood, stone or concrete. Since it is so difficult to dig  beneath the ground water table, dug wells are not very deep. Typically,wells_types_dug they are  only 10 to 30 feet deep. Being so shallow, dug wells have the highest risk of  becoming contaminated.To minimize the likelihood of contamination, your dug well  should have certain features. These features help to prevent contaminants from  traveling along the
outside of the casing, or through the casing and into  the well.

Dug Well Construction Features
  • The well should be cased with a watertight material (for  example, tongue-and-groove pre-cast concrete), and a cement grout or bentonite  clay sealant poured along the outside of the casing to the top of the  well.
  • The well should be covered by a concrete curb and cap that  stands about a foot above the ground.
  • The land surface around the well should be mounded so that  surface water runs away from the well and is not allowed to pond around the  outside of the wellhead.
  • Ideally, the pump for your well should be inside your home or  in a separate pump house, rather than in a pit next to the  well.

Land activities around a dug well can also contaminate it. While dug wells have been used as a household water supply  source for many years, most are relics of older homes, dug before drilling  equipment was readily available, or when drilling was considered too expensive.  If you have a dug well on your property and are using it for drinking water,  check to make sure it is properly covered and sealed. Another problem relating  to the shallowness of a dug well is that it may go dry during a drought when the  ground water table drops.

 

Driven Wells

 

Like dug wells, driven wells pull water  from the water-saturated zone above the bedrock. Driven wells can be deeper than  dug wells. They are typically 30 to 50 feet deep and are usually located in  areas with thick sand and gravel deposits where the ground water table is within  15 feet of the ground’s surface. In the proper geologic setting, driven wells  can be easy and relatively inexpensive to install. Although deeper than dug  wells, driven wells are still relatively shallow and
have a moderate-to-high  risk of contamination from nearby land activities.

Driven Well Construction Features
  • Assembled lengths of 2- to 3-inch diameter metal  pipes are driven into the ground. A screened “well point” located at the end of  the pipe helps drive the pipe through the sand and gravel. The screen allows  water to enter the well and filters out sediment.
  • The pump for the well is in one of two places: on top of the  well, or in the house. An access pit is usually dug around the well down to the  frost line, and a water discharge pipe to the house is joined to the well pipe  with a fitting.
  • The well and pit are capped with the same kind of  large-diameter concrete tile used for a dug well. The access pit may be cased  with pre-cast concrete.

To minimize this risk, the well cover should be a  tight-fitting concrete curb and cap with no cracks, and should sit about a foot  above the ground. Slope the ground away from the well so that surface water will  not pond around the well. If there’s a pit above the well, either to hold the  pump or to access the fitting, you may also be able to pour a grout sealant  along the outside of the well pipe. Protecting the water quality requires that  you maintain proper well construction and monitor your activities around the  well. It is also important to follow the same land-use precautions around the  driven well as described under dug wells.

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Drilled  Wellswells_types_drilled

 

Drilled wells penetrate about 100 to 400 feet  into the bedrock. Where you find bedrock at the surface, it is commonly called  ledge. To serve as a water supply, a drilled well must intersect bedrock  fractures containing ground water.

Drilled Well Construction  Features

  • The casing is usually metal or plastic pipe, 6 inches in  diameter, that extends into the bedrock to prevent shallow ground water from  entering the well. By law, the casing has to extend at least 18 feet into the  ground, with at least 5 feet extending into the bedrock. The casing should  also extend a foot or two above the ground’s surface. A sealant, such as cement  grout or bentonite clay, should be poured along the outside of the casing to the  top of the well. The well should be capped to prevent surface water  from entering the well.Septic tanks are designed to  have a leach field around them, which is an area where wastewater flows out  of the tank. This wastewater can also move into the ground  wate
  • Submersible pumps, located near the bottom of the well, are  most commonly used in drilled wells. Wells with a shallow water table may  feature a jet pump located inside the home. Pumps require special wiring and  electrical service. Well pumps should be installed and serviced by a qualified  professional registered with your state.
  • Most modern drilled wells incorporate a pitless adapter  designed to provide a sanitary seal at the point where the discharge water line  leaves the well to enter your home. The device attaches directly to the casing  below the frost line, and provides a watertight sub-surface connection,  protecting the well from frost and contamination.
  • Older drilled wells may lack some of these sanitary features.  The well pipe used was often 8, 10 or 12 inches in diameter, and covered  with a concrete well cap either at or below the ground’s surface. This outmoded  type of construction does not provide the same degree of protection from surface  contamination. Also, older wells may not have a pitless adapter to provide a  seal at the point of discharge from the well.
Hydrofracting a Drilled Well

Hydrofracting is a process that applies water or air under  pressure into your well to open up existing fractures near your well, and can  even create new ones. Often, this can increase the yield of your well. This  process can be applied to new wells with insufficient yield and to improve the  quantity of older wells.

How can I test  the quality of my private drinking water  supply?

Consider testing your well for pesticides,  organic chemicals, and heavy metals before you use it for the first time. Test  private water supplies annually for nitrate and coliform bacteria to detect  contamination problems early. Test them more frequently if you suspect a  problem. Be aware of activities in your watershed that may affect the water  quality of your well, especially if you live in an unsewered area.

 

Human Health

The first step to protect your health and the health of your  family is learning about what may pollute your source of drinking water.  Potential contamination may occur naturally, or as a result of human  activity.

What are some naturally occurring sources of  pollution?

  • micro-organisms:  Bacteria, viruses,  parasites and other microorganisms are sometimes found in water. Shallow wells — those with water close to ground level — are at most risk. Runoff, or water  flowing over the land surface, may pick up these pollutants from wildlife and  soils. This is often the case after flooding. Some of these organisms can cause  a variety of illnesses. Symptoms include nausea and diarrhea. These can occur  shortly after drinking contaminated water. The effects could be short-term yet  severe (similar to food poisoning), or might recur frequently or develop slowly  over a long time.welldistance 2
  • radionuclides: Radionuclides are radioactive  elements, such as uranium and radium. They may be present in underlying rock and  ground water.
  • radon: Radon is a gas that  is a natural product of the breakdown of uranium in the soil and can also  pose a threat. Radon is most dangerous when inhaled, and contributes to lung  cancer. Although soil is the primary source, using household water containing  radon contributes to elevated indoor radon levels. Radon is less dangerous when  consumed in water, but remains a risk to health.
  • nitrates and nitrites: Although high nitrate  levels are usually due to human activities (see below), they may be found  naturally in ground water. They come from the breakdown of nitrogen compounds in  the soil. Flowing ground water picks them up from the soil. Drinking large  amounts of nitrates and nitrites is particularly threatening to infants (for  example, when mixed in formula).
  • heavy metals: Underground rocks and soils  may contain arsenic, cadmium, chromium, lead, and selenium. However, these  contaminants are not often found in household wells at dangerous levels from  natural sources.
  • fluoride: Fluoride is helpful in dental  health, so many water systems add small amounts to drinking water. However,  excessive consumption of naturally occurring fluoride can damage bone tissue.  High levels of fluoride occur naturally in some areas. It may discolor teeth,  but this is not a health risk.

What human activities can pollute ground  water?

bacteria and nitrates: These pollutants are found in  human and animal wastes. Septic tanks can cause bacterial and nitrate pollution.  So can large numbers of farm animals. Both septic systems and animal manure must  be carefully managed to prevent pollution. Sanitary landfills and garbage dumps  are also sources. Children and some adults are at higher risk when exposed  to waterborne bacteria. These include the elderly and people whose immune  systems are weak due to AIDS or treatments for cancer. Fertilizers can add to  nitrate problems. Nitrates cause a health threat in very young infants called “blue baby syndrome.” This condition disrupts oxygen flow in the blood.

  • concentrated animal feeding operations  (CAFOs): The number of CAFOs, often called “factory farms,” is growing.  On these farms, thousands of animals are raised in a small space. The large  amounts of animal waste/manure from these farms can threaten water supplies.  Strict and careful manure management is needed to prevent pathogen and nutrient  problems. Salts from high levels of manure can also pollute ground water.
  • heavy metals: Activities such as mining and  construction can release large amounts of heavy metals into nearby ground water  sources. Some older fruit orchards may contain high levels of arsenic, once used  as a pesticide. At high levels, these metals pose a health risk.
  • fertilizers and pesticides: Farmers use  fertilizers and pesticides to promote growth and reduce insect damage. These  products are also used on golf courses and suburban lawns and gardens. The  chemicals in these products may end up in ground water. Such pollution depends  on the types and amounts of chemicals used and how they are applied. Local  environmental conditions (soil types, seasonal snow and rainfall) also affect  this pollution. Many fertilizers contain forms of nitrogen that can break down  into harmful nitrates. This could add to other sources of nitrates mentioned  above. Some underground agricultural drainage systems collect fertilizers and  pesticides. This polluted water can pose problems to ground water and local  streams and rivers. In addition, chemicals used to treat buildings and homes for  termites and other pests may also pose a threat. Again, the possibility of  problems depends on the amount and kind of chemicals. The types of soil and the  amount of water moving through the soil also play a role.
  • industrial products and waste: Many harmful  chemicals are used widely in local business and industry. These can pollute  drinking water if not well-managed. The most common sources of such problems  are:
    • local businesses: These include nearby  factories, industrial plants, and even small businesses such as gas stations and  dry cleaners. All handle a variety of hazardous chemicals that need careful  management. Spills and improper disposal of these chemicals and  other industrial wastes can threaten ground water supplies.
    • leaking underground tanks and piping:  Petroleum products, chemicals and waste stored in underground storage tanks and  pipes may end up in the ground water. Tanks and piping leak if they are  constructed or installed improperly. Steel tanks and piping corrode with age.  Tanks are often found on farms. The possibility of leaking tanks is great on  old, abandoned farm sites. Farm tanks are exempt from the EPA rules for  petroleum and chemical tanks.
    • landfills and waste dumps: Modern landfills  are designed to contain any leaking liquids. But floods can carry them over the  barriers. Older dumpsites may have a wide variety of pollutants that can seep  into ground water.
  • household waste: Improper disposal of many  common products can pollute ground water. These include cleaning solvents, used  motor oil, paints, and paint thinners. Even soaps and detergents can harm  drinking water. These are often a problem from faulty septic tanks and septic  leaching fields.
  • lead and copper: Household plumbing  materials are the most common source of lead and copper found in home  drinking water. Corrosive water may cause metals in pipes or soldered joints to  leach into your tap water. Your water’s acidity or alkalinity (often measured as  pH) greatly affects corrosion. Temperature and mineral content also affect how  corrosive it is. They are often used in pipes, solder and plumbing  fixtures. Lead can cause serious damage to the brain, kidneys, nervous system,  and red blood cells. The age of plumbing materials — in particular, copper pipes  soldered with lead — is also important. Even in relatively low amounts, these  metals can be harmful. The EPA rules under the Safe Drinking Water Act limit  lead in drinking water to 15 parts per billion. Since 1988, the Act allows  only lead-free pipe, solder and flux in drinking water systems. The law  covers both new installations and repairs of  plumbing.

What You Can  Do…

Private, individual wells are the responsibility of the  homeowner. To help protect your well, here are some steps you can  take:

Have your water tested periodically. It is recommended that  water be tested every year for total coliform bacteria, nitrates, total  dissolved solids, and pH levels. If you suspect other contaminants, test for  those. Always use a state-certified laboratory that conducts drinking water  tests. Since these can be expensive, spend some time identifying potential  problems. Consult your InterNACHI inspector for information about how to go  about water testing.

Testing more than once a year may be warranted in  special situations if:

  • someone in your household is pregnant or  nursing;
  • there are unexplained illnesses in the  family;
  • your neighbors find a dangerous contaminant  in their water;
  • you note a change in your water’s taste,  odor, color or clarity;
  • there is a spill of chemicals or fuels into  or near your well; or
  • you replace or repair any part of your well  system.

Identify potential problems as the first step to safe-guarding your drinking  water. The best way to start is to consult a local expert  — someone who knows your area, such as the local health department,  agricultural extension agent, a nearby public water system, or a geologist at a  local university.

Be aware of your surroundings. As you drive around your  community, take note of new construction. Check the local newspaper for articles  about new construction in your area.

Check the paper or  call your local planning and zoning commission for announcements about  hearings or zoning appeals on development or industrial projects that could  possibly affect your water.

Attend these hearings, ask questions about how your water  source is being protected, and don’t be satisfied with general answers.   Ask questions, such as:  “If you build this landfill, what will you do  to ensure that my water will be protected?” See how quickly they answer and  provide specifics about what plans have been made to specifically address that  issue.

Identify Potential Problem Sources

To start your search for potential problems, begin close to  home. Do a survey around your well to discover:

  • Is there livestock nearby?
  • Are pesticides being used on nearby agricultural crops or  nurseries?
  • Do you use lawn fertilizers near the well?
  • Is your well downstream from your own or a neighbor’s septic  system?
  • Is your well located near a road that is frequently salted or  sprayed with de-icers during winter months?
  • Do you or your neighbors dispose of household waste or used  motor oil in the backyard, even in small amounts?

If any of these items apply, it may be best to have your water  tested and talk to your local public health department or agricultural extension  agent to find ways to change some of the practices which can affect your private  well.

In addition to the immediate area around your well, you  should be aware of other possible sources of contamination that may already be  part of your community or may be moving into your area. Attend any local  planning or appeals hearings to find out more about the construction of  facilities that may pollute your drinking water. Ask to see the environmental  impact statement on the project. See if the issue of underground drinking water  sources has been addressed. If not, ask why.

 

Common Sources of Ground Water  Contamination

 

Category         Contaminant Source
Agricultural
  • animal burial areas
  • drainage fields/wells
  • animal feedlots
  • irrigation sites
  • fertilizer storage/use
  • manure spreading areas/pits,  lagoons
  • pesticide  storage/use
Commercial
  • airports
  • jewelry/metal plating
  • auto repair shops
  • laundromats
  • boat yards
  • medical institutions
  • car washes
  • paint shops
  • construction areas
  • photography establishments
  • cemeteries
  • process waste-water drainage
  • dry cleaners fields/wells
  • gas stations
  • railroad tracks and yards
  • golf courses
  • research laboratories
  • scrap and junkyards
  • storage tanks
Industrial
  • asphalt plants
  • petroleum production/storage
  • chemical manufacture/storage
  • pipelines
  • electronic manufacture
  • process waste-water drainage
  • electroplaters fields/wells
  • foundries/metal fabricators
  • septage lagoons and sludge
  • machine/metalworking shops
  • storage tanks
  • mining and mine drainage
  • toxic and hazardous spills
  • wood-preserving facilities
Residential
  • fuel oil
  • septic systems, cesspools
  • furniture stripping/refinishing
  • sewer lines
  • household hazardous products
  • swimming pools (chemicals)
  • household  lawns
Other
  • hazardous waste landfills
  • recycling/reduction facilities
  • municipal incinerators
  • road de-icing operations
  • municipal landfills
  • road maintenance depots
  • municipal sewer lines
  • Storm water drains/basins/wells
  • open burning sites
  • transfer stations

 

 

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From  Private Water Wells – (InterNACHI)