Just like every pig is unique, the same holds true for the water it consumes. Every farm, well and surface water source is different, says Dr. Gabi Doughan, veterinarian and technical project specialist in the College of Veterinary Medicine at Iowa State University.
“It’s a unique fingerprint of different water quality parameters and the biology growing inside those water lines,” Doughan says.
Because of this diversity, it should come as no surprise that there is no “silver bullet” for water treatment.
“You can’t just say, ‘we’re going to use this disinfectant, at this rate, at this time,’ and apply it across the country,” Doughan warns. Instead of a one-size-fits-all product, she advises producers to follow a strategic, four-step framework to evaluate and secure their water lines.
1. Establish Your Baseline
Before purchasing any chemical treatments, determine your water’s unique chemical and biological makeup. Testing is recommended at least once a year, but twice a year is ideal if resources are available.
“Even if you have treated rural or municipal water, you must establish a baseline of what the incoming water is contributing to the farm before it enters your pipes,” Doughan says.
To get an accurate “pulse” of your water, Doughan recommends a strategic, two-sample approach to isolate where issues are originating. She recommends contacting your veterinary diagnostic lab or a specialized water-testing lab to obtain sampling kits and determine exactly what parameters (such as pH, minerals and coliforms) to test for.
Sample 1: The Source Water
- Where to pull: Directly at the wellhead or the point of entry into the farm.
Sample 2: Inside the Barn (The End of the Line)
- Where to pull: From the ball valves located at the very end of the water lines.
- How to pull: Flush the ball valves out for 20-30 seconds before catching your sample to clear any stagnant debris.
Avoid sampling water nipples if possible, she advises. Because pigs touch and lick them, they are heavily contaminated with environmental manure and urine. Sampling them will skew results and make it hard to tell if the contamination is coming from the water line or the pig.
2. Identify Your Target Issues
Collecting both the source and end-of-line samples is essential to diagnosing the exact problems you need to solve.
“Your well could be contributing a specific mineral factor, while your internal pipe biofilms could be contributing even more to bacterial content and coliforms,” Doughan explains.
Once you have your lab results back, evaluate the exact parameters that are threatening your pigs, your medications or your biosecurity:
- High iron: Does the water have a strong iron taste that causes pigs to back off drinking? (Iron also acts as a primary fuel source that accelerates biofilm growth).
- High sulfates: Are elevated sulfates or total dissolved solids (TDS) triggering non-pathogenic, osmotic diarrhea that you are wasting money trying to medicate?
- Biofilm buildup: Is a heavy bacterial slime layer inside your pipes actively shielding pathogens and shedding coliforms into the water?
3. Tailor and Execute a Two-Pronged Cleaning Strategy
Once you have identified your targets, share your water quality test panel directly with your biocide and chemical manufacturers. They can help you match specific products to your unique mineral and biological load.
Doughan emphasizes that a successful protocol must be tailored to what the farm is physically comfortable performing, taking into account its downtime, labor and farm type.
“My research shows that biofilms can grow back within just three days of a cleanout,” Doughan warns. To fight this rapid regrowth, producers must execute a customized, two-pronged attack:
Step A: Terminal Line Cleaning (The Heavy Stripper)
- When: Administered only when the barn is completely empty between groups of pigs.
- What it does: Uses a high concentration of acidifiers, descalers and disinfectants to strip thick mineral scaling and organic biofilm off pipe walls. This is not safe for pigs to drink.
- How to choose: Select a product based on your baseline water test, the chemistry of your mineral buildup, your budget and how much downtime you have between groups.
Step B: Continuous Disinfection (The Daily Guard)
- When: Administered daily while pigs are actively in the barn.
- What it does: Uses low, pig-safe concentrations of disinfectant to keep the water clean and prevent biofilms from rapidly reforming.
- The Catch: Continuous disinfection is safe for pigs to drink, but Doughan points out that it is not strong enough to strip away heavy, pre-existing mineral scale. Use terminal cleaning to strip the lines first, then use continuous treatment to keep them clean. Regulatory status of the use of these products must also be considered because we are producing food animals.
Remember that population flow completely changes the types of chemistries you can safely use at a given time. Grow-finish farms operate on an “all-in, all-out” schedule, making terminal cleaning straightforward. Sow farms have a continuous population of animals, making a full-system terminal cleaning highly difficult.
“Because breeding and gestation areas are constantly populated, terminal cleaning is highly restricted,” Doughan explains. “A starting point is to apply the heavy terminal line cleaner in the farrowing rooms during downtime when no pigs are there, provided your plumbing infrastructure is plumbed to isolate those rooms. Then, follow up with continuous disinfection once the next group moves in. You can apply continuous disinfection in breeding and gestation, but if you have significant, pre-existing mineral and biofilm buildup, it likely won’t remove it all without that initial terminal strip.”
4. Don’t Ignore the Medicator Blindspot
Even if your water lines are perfectly clean, your treatment protocols will fail if your delivery system is broken. Medicators often do not dose appropriately, even straight out of the box, Doughan says.
An uncalibrated medicator can severely underdose or overdose your pigs. Underdosing fails to cure the pigs and drives rapid antimicrobial resistance, while overdosing wastes expensive medication. If your medicator fails its calibration check, reach out directly to the equipment manufacturer for troubleshooting and replacement parts, she advises.
Producers can find step-by-step guidance on how to do this in the Water Line System Management for Swine Production resource, co-developed by the Iowa Pork Industry Center.
“Water is a physiological need for pigs, regulating growth, temperature control and overall behavioral needs,” Doughan says. “Without regular cleaning and disinfection, biofilms can accumulate within water line systems and impact health, production and water-administered medication.”
