In this article:
- What Nitrates Are and Where They Come From
- Why Well Owners in Southeastern PA Should Pay Attention
- Health Risks: Who Is Most at Risk?
- How to Test Your Well Water for Nitrates
- Nitrate Treatment Options for Well Water
- What Does NOT Remove Nitrates
- Preventing Nitrate Contamination at the Source
- Nitrates and Real Estate Transactions in Pennsylvania
- Schedule a Free Water Test (fill out the form on this page)
- FAQs
If your home runs on a private well anywhere in Bucks, Chester, Montgomery, Berks, Delaware, or Lehigh County, nitrate contamination is one of the more common water quality issues you could be facing, and one of the hardest to catch on your own. Nitrates have no taste, no smell, and no color. A test is the only way to know they are there.
This guide walks through what nitrates are, why southeastern Pennsylvania wells are exposed to them, who is most at risk, and what actually works to get them out of your water.
What Nitrates Are and Where They Come From
Nitrates are nitrogen based compounds that show up naturally in soil and water at low, harmless levels. The problem starts when nearby land use pushes those levels higher than they should be.
In the rural and semi rural parts of southeastern Pennsylvania, the most common sources are:
Nitrates move easily through soil and into groundwater. If your well is shallow, or if you are near active farmland or an older septic system, your odds of elevated nitrate levels go up.
Why Well Owners in Southeastern PA Should Pay Attention
Southeastern Pennsylvania has a large number of private wells, and a lot of active agriculture sitting right next to them. Farmland in eastern Berks County, southern Chester County, and parts of upper Bucks and the Lehigh Valley sits close enough to residential wells that nitrate loading in groundwater is a genuine and ongoing concern, not a rare event.
The Pennsylvania Department of Environmental Protection recommends testing private wells at least once a year for nitrates, particularly if you live near farmland, have a shallow well, or have never had your water tested. The federal Maximum Contaminant Level (MCL) for nitrates in drinking water is 10 milligrams per liter, measured as nitrogen. Above that number, the water is considered unsafe for infants and other sensitive groups. Many water professionals recommend acting before you get anywhere near that threshold, especially in a household with infants or a pregnant family member.
Health Risks: Who Is Most at Risk?
For most healthy adults, short term exposure to moderately elevated nitrates is not an emergency. For certain groups, it is a real and immediate risk.
Infants under six months
This is the group at greatest risk. High nitrate levels interfere with the blood’s ability to carry oxygen, a condition called methemoglobinemia and more commonly known as blue baby syndrome. It is a medical emergency, and it is the reason the entire 10 mg/L standard exists in the first place. The EPA’s own research on nitrate in groundwater points directly to protecting infants as the basis for that limit, and the CDC’s toxicology summary on nitrate exposure walks through why infants are affected so much more severely than older children and adults.
Pregnant women
Pregnant women are also advised to avoid water with elevated nitrates, since there is evidence linking high exposure to complications during pregnancy.
People with certain health conditions
People with reduced stomach acid or certain enzyme deficiencies may also be more sensitive to nitrate exposure than the general population.
For everyone else, long term exposure to elevated nitrates is still worth taking seriously. If you have noticed other changes in how your water looks, smells, or makes you feel, it is worth reading through our guide on well water and unexplained symptoms. The bottom line on nitrates specifically: if your well tests above 10 mg/L, you need to act. If you have infants or are pregnant, treat any reading above 5 mg/L with caution until you have a working treatment system in place.
How to Test Your Well Water for Nitrates
Testing is the only way to actually know what is in your water. Here is how the process should work.
Use a licensed water testing professional. A lab verified test tells you exactly what is in your water. At home test strips exist, but they are not reliable enough for a health based decision. If you are in Bucks, Chester, Montgomery, Berks, Delaware, or Lehigh County, our team can come to your home, pull a proper sample, and get it to a certified lab.
Ask for a comprehensive panel, not just nitrates. Nitrates rarely show up alone. If runoff or a failing septic system is the source, you may also have coliform bacteria or other contaminants in the same well. A full panel gives you the complete picture instead of one data point.
Test on a regular schedule. Nitrate levels shift seasonally, especially after heavy rain or spring snowmelt when runoff peaks. Once a year is the minimum. If you border active farmland, twice a year is a reasonable precaution. Our annual well water check up guide covers what a good yearly routine looks like.
Keep your records. If you ever sell your home, documented test results are valuable. Real estate transactions involving private wells in Pennsylvania require DEP compliant testing, and a clean history speeds up the process.
Ready to find out what is actually in your well? Fill out the form on this page to schedule a free water test, and we will walk you through the results in plain language.
Nitrate Treatment Options for Well Water
Once elevated nitrates are confirmed, there are a small number of treatment methods that are actually proven to work. Not every filter removes nitrates, so the specific system matters here.
Reverse Osmosis
Forces water through a semi permeable membrane that blocks nitrates and much more, including PFAS, lead, and arsenic. Typically installed under the kitchen sink to treat drinking and cooking water. Often the fastest option for a household with infants or a pregnant family member.
Ion Exchange (Nitrate Selective Resin)
Uses a resin designed specifically to target nitrate ions and swap them for chloride. This is different from a standard water softener, and it treats every tap in the house rather than just the kitchen sink.
Distillation
Boils water and collects the steam, leaving nitrates and other contaminants behind. It works, but it is slow and energy intensive. Most homeowners use it as a backup rather than a primary system.
Reverse Osmosis Systems
Reverse osmosis is the most widely recommended point of use treatment for nitrates. It is relatively low maintenance and can handle several other common well water problems at the same time. Our team installs reverse osmosis drinking water systems throughout Bucks, Chester, Montgomery, Berks, Delaware, and Lehigh counties.
Ion Exchange for Whole Home Coverage
If you want every tap in the house protected, not just the kitchen sink, a nitrate selective ion exchange system is the more common route. It is a good fit if your test results show elevated nitrates throughout the supply, not just at one fixture. Our water treatment systems team can size and configure the right unit once your test results are in hand.
Dierolf often runs promotions on drinking water and water treatment systems. Check our current offers before you schedule anything.
See Current Water Treatment Specials
What Does NOT Remove Nitrates
This part matters, because a lot of homeowners assume whatever filter they already own is handling everything.
If you have a whole home carbon filter or a basic pitcher filter on your counter, it is not protecting you from nitrates. Boiling does not help either. It actually concentrates nitrates as the water evaporates, which makes the problem worse, not better. If you are not sure what your current setup actually removes, a water test and a straight conversation with a water treatment professional is the right place to start.
Preventing Nitrate Contamination at the Source
Treatment handles what is already in your water. It also helps to cut down how much reaches your well in the first place.
- Maintain your septic system. Have it inspected and pumped on schedule. A failing septic system is one of the most direct paths for nitrates to reach your well.
- Keep your wellhead in good shape. Cracks or gaps in the well casing let surface water, and whatever it carries, get in directly. A licensed well inspection can catch these issues before they become a real problem.
- Go easy on lawn fertilizer. Use only what the soil actually needs. Over applying fertilizer near a well adds directly to nitrate loading in the ground beneath it.
- Know what is upstream. If a farm or a large property borders yours, pay attention to when fields get fertilized and test your water again after heavy rain.
Our team handles well inspections, pump and tank service, and general well system maintenance across Bucks, Chester, Montgomery, Berks, Delaware, and Lehigh counties. If your well has not been looked at in a while, that is a reasonable place to start.
Nitrates and Real Estate Transactions in Pennsylvania
If you are buying or selling a home with a private well in Pennsylvania, nitrate testing is part of the standard process. The state’s DEP compliant water testing panel includes nitrates alongside bacteria and basic chemistry.
For buyers, this is your chance to know exactly what you are getting into before closing. If a test comes back with elevated nitrates, you can negotiate for a treatment system to be installed before you sign, or factor the cost into your offer. If you are looking at a well property anywhere in Bucks County, our 10 things to check before closing on a well covers more than just nitrates.
For sellers, having recent, clean test results ready speeds everything up and builds confidence with buyers and their agents. Our real estate testing team provides fast turnaround testing built around closing deadlines throughout southeastern PA.
Working against a closing date?
We provide DEP compliant water testing with fast turnaround for real estate closings across southeastern PA.
Fill out the form on this page to schedule testing.
Not sure which system fits your situation once results are in? Our guide on choosing the right water treatment system for your home is a useful next read.
💧 A water test takes one visit and tells you exactly what’s in your well. No obligation, no pressure.
Schedule a Free Nitrate Water Test
A real technician comes out, pulls a proper sample, and gets it to a certified lab. Once results are back, we’ll walk you through what they mean and what your options actually are, no pressure either way.
Serving Bucks, Chester, Montgomery, Berks, Delaware, and Lehigh Counties
Fill out the contact form on this page and someone from our team will be in touch to schedule your visit.
FAQs
What is the safe level of nitrates in drinking water?
The EPA’s Maximum Contaminant Level for nitrates is 10 mg/L, measured as nitrogen. For infants under six months and pregnant women, many water professionals recommend treating any reading above 5 mg/L as a precaution rather than waiting to hit the federal limit.
Can I taste or smell nitrates in my well water?
No. Nitrates are completely colorless, odorless, and tasteless. The only way to know if your water has elevated nitrates is a lab test. Fill out the form on this page to schedule a free water test if it has been a while since your last one.
Does a water softener remove nitrates?
No. A standard water softener removes hardness minerals like calcium and magnesium, but it does not touch nitrates. You need either a nitrate selective ion exchange system or a reverse osmosis system to actually remove them.
How often should I test my well for nitrates in Pennsylvania?
At least once a year, per PA DEP guidance. If you live near active farmland or have a shallow well, testing twice a year, particularly after spring runoff, is a sensible precaution.
What’s the fastest way to protect my family while I figure out a treatment system?
A point of use reverse osmosis system under the kitchen sink is typically the fastest practical fix. It treats the water you actually drink and cook with while you decide on a whole home approach. Fill out the form on this page and we can often get one installed quickly.
Are nitrates more common in certain parts of southeastern PA?
Yes. Areas with heavier agricultural activity, including parts of Berks and Chester counties, tend to see higher rates of nitrate contamination in private wells due to fertilizer and manure runoff. Shallow wells in any of our six counties carry elevated risk regardless of location.
Do I need a professional to install a nitrate removal system?
For a point of use reverse osmosis system, some homeowners handle the install themselves. For a whole home ion exchange system, professional installation is strongly recommended so it is sized correctly and integrated properly with your plumbing.
