In the City of Rockford, the Water Division supplies about 55,000 water customers and Four Rivers Sanitation Authority collects and treats the sewage. On a lot with its own well and septic system, the owner answers for both. The Illinois EPA states the well half of that plainly: private water well owners have the primary responsibility to test their well water.

If you are comparing homes for sale in Winnebago County, one line in a listing can mean two different sets of duties. Gambino Realtors has worked in the Rockford area since 1923. This guide sets the two setups side by side using only what the county health department, Four Rivers Sanitation Authority, the City of Rockford, the Illinois Department of Public Health, the Illinois EPA and the U.S. EPA publish. It does not rank them. It is a plain explanation of the rules, not legal, tax or financial advice, and the offices named here have the last word on any one property.

Who Answers For What On Each Kind Of Lot

Start with the public side, because the paperwork is easier to see. The City of Rockford says its Water Division is responsible for production, quality control, water treatment, distribution and related services. The city's source is groundwater. Its page on the water system says water comes from 30 wells and not from the Rock River, and that it is treated at the well sites with fluoride, polyphosphates and chlorine. The same page says filtration plants were designed to remove iron, manganese and radium. What differs is who tests it, who treats it and who gets the call when something is wrong.

On testing, the city's water quality page says its staff run approximately one hundred and eight analytical tests each day, about 40,000 per year, and that the Illinois EPA also tests the water. The Illinois EPA's private well page adds the contrast from the state side. Public water systems are tested regularly, and for a private well, regular testing is the owner's responsibility. The county health department's own wells page is blunter still: no one else tests or monitors your private water well.

Sewer follows the same split. Four Rivers Sanitation Authority describes itself as a sanitary district founded in 1926, governed by a five-member Board of Trustees appointed by the Winnebago County Board. It serves approximately 240,000 people in Winnebago County, including Rockford, Loves Park, Machesney Park, Roscoe, Cherry Valley, New Milford and Winnebago, plus a small part of Rockton and Boone County. It says it is not involved with potable water distribution. That matters when you read a utility bill, because the water department and the sewer authority are two different bodies. The authority's well page tells a buyer to find out from the realtor, the plumber or the previous owner which water department serves the home, since some homes are served by a well and not by a water department at all.

For a septic system, the Illinois EPA says septic systems, like private wells, are the homeowner's responsibility. The Illinois Department of Public Health regulates the installation of private sewage disposal systems that have no surface discharge, such as septic tanks and seepage fields. It also licenses the installation and pumping contractors. In Winnebago County the local office is the health department's Center for Environmental Health Improvement. It says its wells and septic program permits, inspects and regulates private water well and sewage systems, and that permits and inspections are required to build new systems or modify existing ones.

Here is the same material as a short side-by-side. Each line comes from the pages named above.

• Drinking water on the public side: supplied and tested by the water department. In Rockford that is the Water Division, with Illinois EPA testing as well.
• Drinking water on a well: tested by the owner. The county page says no one else tests or monitors a private well.
• Sewage on the public side: collected and treated by Four Rivers Sanitation Authority where its sewer serves the property.
• Sewage on septic: the homeowner's responsibility, with the county health department permitting and inspecting the system and the state licensing the contractors.
• The bill: city water is billed from a meter read every month and billed in arrears, with garbage on the same bill.

The last bullet is a practical clue. The county health department lists the signs of a well as a water line coming into the house with no meter, no water bill, or a well cover or cap in the yard. It lists the signs of a septic system as no wastewater bill, neighbors who have septic or a rural location. None of that replaces the records, but it tells you which column of the list you are standing in before you ask for them.

What Gets Tested, Inspected And Disclosed When You Buy

Three lines of the Illinois disclosure form bear on this guide. The Residential Real Property Disclosure Report in 765 ILCS 77/35 asks whether the seller is aware of material defects in the well or well equipment, of unsafe conditions in the drinking water, and of material defects in the septic, sanitary sewer or other disposal system. The form says it is not a substitute for any inspections or warranties a buyer or seller may want. It also says that a seller's lack of awareness of a condition is no guarantee that the condition does not exist. For a home on a well or septic system, those lines are where the inspection conversation starts. They are not where it ends.

Take the well first. The county health department recommends testing a private well once a year for coliform bacteria, nitrates and nitrites and any other contaminants of local concern. It also says to test when the taste, odor or appearance changes and when the system is serviced. The Illinois Department of Public Health sorts it by contaminant. Bacteria and nitrate are every year. Metals are every 3 years. Volatile organic compounds, pesticides and PFAS are tested if they are detected nearby. It lists flooding or land disturbance near the well and any repair or replacement of part of the well system as reasons to test too. Nitrate comes from sources such as septic systems, manure storage areas, feedlots and farm fields.

Where does the sample go? The county page says residents with a private well can have water tested through the City of Rockford Environmental Laboratory, in approved bottles. The sample must be dropped off at the laboratory at 1111 Cedar Street, with the laboratory's form. The laboratory's Water Quality Section answers questions at 779-348-7151. The laboratory publishes its own fee schedule, so ask it for prices.

One limit is worth stating plainly. That makes the seller's own records and your own sample the two places a buyer can look.

Septic is the other half. The county's advice is short: have septic systems inspected before you purchase a home. It also says the health department conducts the inspections a mortgage or banking institution requires when making a loan on a property with a private well, septic system or both. Its permit page lists a Loan Inspection Request, described as a well and septic inspection for a realty transaction that includes the FHA and VA versions. The county pages do not say that every sale of such a house needs a county inspection, and this guide will not say so either. The U.S. EPA's guide for homebuyers puts it this way. Inspections may be required by local or state government or by your mortgage lender, and the results can help you decide whether the home is right for you.

What does an inspection look at? The Illinois Department of Public Health publishes an evaluation form that gets specific. The ground around the tank is checked for discharge or saturation, the inlet and outlet baffles are looked at, and the date of the last pumping is recorded. The evaluation is meant to be done after 48 hours without precipitation, and the form checks whether the sludge and scum layers together are under 33 percent of the designed liquid level. The form says that a marked box in its yellow column means the system may be in a state of failure, and that a licensed installation contractor should look at it.

The public side has its own sale-time check. Four Rivers Sanitation Authority's code says that no person may sell, transfer or convey a building serviced by Authority sewer until a current certification of compliance has been obtained and deposited with the Authority. A licensed plumber completes the form. It records the use of the building and where any roof or foundation drain or sump pump discharges. A certification is not current after one year. A sale that results in no new account establishment or transfer is exempt.

If the plumber finds a problem, the code sets clocks. A roof or foundation drain, sump pump or diverter valve installation that is illegal carries a 30-day compliance period. Clear water entering the sanitary sewer through an under-the-basement-floor connection carries a 60-day period. A buyer can keep a sale moving by depositing a contract or accepted bid for the work, evidence that adequate funds were paid or escrowed, and a stipulation to finish within the period. The code also says the certification reflects a limited visual inspection by the plumber, and that the owner bears the cost of choosing the plumber. If you are buying a house on sewer, ask who has the certification and when it is dated.

Repairs, Additions And What Changes When A Sewer Arrives

Both setups need upkeep, but the schedules come from different sources. On a well, the county page says the casing must be at least 8 inches above the ground surface and free from wood chips, soil, brush and leaves, and that landscaping should not create a bowl effect around it. A well that is no longer used has its own rule. A licensed water well driller does the sealing unless the homeowner makes a written request to the local health department or the state describing procedures and materials that comply with the code.

On septic, the county says to have the system inspected every 3 years by a licensed contractor, to have the tank pumped as necessary, generally every 3 to 5 years, and to have an effluent filter inspected and cleaned once a year. It gives the average lifespan as 15 to 40 years, longer with maintenance. The Illinois EPA suggests annual inspection for sludge and solids and pumping every two to three years or sooner if needed. Those numbers differ. Treat the county's page as the local statement and ask a licensed contractor what the tank in front of you needs. The drainfield has its own rules in the county's words: only grass is planted on or near it, no sprinkler heads are installed, and nothing is parked, driven or built on it.

That drainfield rule collides with projects. The county health department says site verifications are required for any property with a private well or septic system when the work needs a building permit, and are useful for other building or landscaping projects too. Its form covers the distances between the septic field, the tank and the well. It also lists a well and septic variance, for an installation that cannot meet every state and county code, and states that approvals are subject to review and are not guaranteed. The county ties that requirement to properties with a private well or septic system, so it is a rule about the lot.

A buyer on septic will want to know what happens if a sewer comes down the road. Four Rivers Sanitation Authority gives a way to find out. Its Sewer Inquiry Form is for realtors, homeowners and prospective buyers, and it returns one of three answers: not available with no plans to extend, not available now but could be extended, or available, with what money is payable before connection and what the owner must do to get sewer to the house.

When neighbors ask for a sewer, the authority's special assessment FAQ describes the path. The authority says the process typically takes at least 6 to 12 months. The owner then carries three kinds of cost. The plumbing from the stub at the property line to the house is the owner's cost, and abandoning the septic system may add more, with the abandonment requirements set by the county health department.

Does a sewer in the street force a hookup? The authority's FAQ answers that no immediate connection is needed if the private septic system is in good operable condition. It adds that if the septic system fails, the county health department would require the owner to connect to public sewer. Its code, for its part, says a building may not connect to a sewer unless the entire property is within the authority's corporate limits and directly served by its sewer, and that an owner may not avoid connection because of the distance from the building to the connection point. When the septic tank is retired, the county's Private Sewage Disposal Code applies. A licensed plumber is needed, the tank is pumped by a licensed pumper, the top and one side are collapsed, and the tank is filled right away with sand, gravel or similar material.

Water has its own gate. The City of Rockford's annexation policies, dated September 2022, say the city will not extend municipal services, which they define to include City of Rockford water and Four Rivers Sanitation Authority sewer, unless the adjacent land is annexing or signing a pre-annexation agreement. They say individual property owners are not allowed to hook up to city water without first signing an agreement to annex. The same document says the Water Division should have the right to approve all well permits within the Ultimate Annexation Boundary before the county health department issues them. If a lot sits outside the city and you are counting on city water later, that is a question for the City of Rockford before you write the offer, not after.

There is also a billing wrinkle for homes that have a well and a sewer connection. The authority bills non-metered well customers based on an average of all single-family residential accounts, and it says this may or may not reflect your sewer usage. A well meter lets it bill actual use. Its two pages state different meter fee amounts, so this guide leaves the amount out and points you to the authority's Customer Service line at 815-387-7500.

None of this is a reason to prefer one setup over the other. It is a reason to read the right column. The public side gives you an institution to call, a bill that arrives monthly, and a sewer certification at sale. The private side gives you a lot where the water and the waste both belong to you, with a county office that permits, inspects and regulates them. The cost and the effort sit in different places, and the sources do not say which place is lighter.

Bottom Line

Public water and sewer put the testing, treating and collecting in the hands of a water department and Four Rivers Sanitation Authority. A well and septic system put all of it in the owner's hands, with the Winnebago County Health Department permitting and inspecting. Before an offer, ask for the records that fit the house in front of you. For a well, that is recent test results and the contractor history. For sewer, it is the dated certification of compliance. If you are weighing homes for sale in Winnebago County, the question to settle early is which column the house sits in, and the health department's Center for Environmental Health Improvement at 815-720-4100 and the authority's customer service at 815-387-7500 can confirm the rest.

For the county's own rules on private systems, read the county health department well and septic guide. For what the seller must put on paper, see the Illinois seller disclosure report. For vacant land where neither system exists yet, see sewer and water availability for land near Rockford.

That covers the two setups side by side. The questions below are the ones a buyer needs answered before the contract, so they are worth a minute before you call anyone.

Frequently Asked Questions