In pig farming, feed, ventilation and biosecurity receive constant attention. Yet one essential factor is sometimes underestimated: the quality of the water supplied to the animals.
Water plays a role in hydration, digestion, body temperature regulation and milk production in sows. It is also an important factor in the hygiene of the facilities and in the delivery of certain veterinary treatments.
According to IFIP – Institut du porc (the French pork industry institute), drinking water accounts for around 94% of the water consumed on a pig farm, with the remainder used mainly for cleaning and other technical purposes.
But having enough water does not necessarily mean having water of suitable quality. Micro-organisms, excess iron or manganese, deposits in the pipes: several parameters can affect drinking conditions and the operation of the equipment.
So, how does water quality affect pig farming, and how can problems be identified before they take a toll on the farm?
Why is water essential in pig farming?
Water is an essential nutrient for pigs, just like the components of their feed. It is involved in many physiological functions and must remain available in sufficient quantity at every stage of production.
In particular, it contributes to nutrient transport, digestion, the elimination of metabolic waste and the maintenance of fluid balance.
It also plays a major role in thermoregulation. Pigs have a limited ability to shed heat through sweating. As temperatures rise, their water requirements can therefore change significantly.
For lactating sows, the stakes are even higher: water contributes to the production of the milk the piglets need.
An insufficient supply can therefore become a limiting factor, regardless of the quality of the ration provided.
For this reason, simply having a water resource on the farm is not enough. You also need to check that the animals can actually drink suitable water, with sufficient flow and regular access.
How much water does a pig drink per day?
Requirements vary with age, weight, physiological stage, ambient temperature, feed composition and housing conditions.
The values below are indicative orders of magnitude, not fixed consumption figures applicable to every farm.
| Animal category | Indicative consumption |
|---|---|
| Weaned piglets | 1 to 4 liters/day |
| Growing pigs | 4 to 8 liters/day |
| Finishing pigs | 6 to 12 liters/day |
| Gestating sows | 10 to 20 liters/day |
| Lactating sows | 20 to 40 liters/day, sometimes more |
These ranges are intended only for preliminary sizing and for understanding requirements. They must be adapted to the actual situation of the farm and to the recommendations of its technical advisers.
For example, a unit of 250 finishing pigs drinking an average of 8 liters per animal per day represents 2,000 liters of drinking water per day.
However, daily volume alone is not enough to size an installation: several animals may drink at the same time, especially around feeding times. The instantaneous flow available at the drinkers is therefore just as important as the total volume.
Can poor-quality water affect pig performance?
Yes, depending on the nature and extent of the problem. The consequences can be direct, when the water carries pathogens, or indirect, when it disrupts equipment and drinking conditions.
Feed intake and growth
In pigs, water intake and feed intake are closely linked.
If access to water becomes insufficient, for example because of low flow or a blocked drinker, feed intake may also be affected.
This can undermine the conditions needed for steady growth and efficient feed conversion.
However, causes need to be distinguished: a drop in intake may also be linked to temperature, disease, feed or other husbandry factors. On its own, it does not prove that the water is contaminated.
Digestive health and microbiological risk
IFIP points out that poor bacteriological quality of drinking water is a health risk factor, particularly for digestive disorders.
Contaminated water can contribute to the transmission of certain pathogens. The risk depends on the type of micro-organisms, their concentration and the susceptibility of the animals.
Vigilance is particularly important in the post-weaning period, when piglets go through major dietary, physiological and environmental changes.
Milk production in sows
Water requirements rise sharply during lactation.
A lactating sow must have sufficient access to water to meet her physiological needs and support milk production.
A supply problem can be detrimental to the sow and her litter. However, improving water quality does not automatically guarantee higher milk production: this also depends on the ration, health status, herd management and many other factors.
Which contaminants and parameters should be monitored in pig farm water?
The quality of drinking water cannot be judged by its appearance alone. Clear water may be microbiologically contaminated, while mineral-rich water can cause technical difficulties without necessarily being toxic to the animals.
1. Microbiological parameters
Bacteriological analyses are used in particular to look for indicators of faecal or organic contamination.
IFIP's guide to good hygiene practices in pig farming recommends monitoring, among others, total coliforms, Escherichia coli, intestinal enterococci and sulphite-reducing bacteria.
These parameters make it possible to assess the hygienic quality of the water and to identify any contamination.
2. Iron and manganese
Iron and manganese occur naturally in some groundwater.
At high concentrations, they can promote deposits, clog pipes and disrupt the operation of drinking equipment.
They can also interfere with certain disinfection operations and contribute to problems in water lines.
Among the technical values set out in its guide, IFIP mentions iron below 200 µg/L and manganese below 50 µg/L.
These benchmarks must be interpreted in their technical context and do not, on their own, constitute universal regulatory toxicity thresholds for pigs.
3. pH and hardness
pH indicates how acidic or alkaline the water is. It can influence the effectiveness of certain disinfection treatments and the stability of products administered through the water line.
Hardness depends mainly on the presence of calcium and magnesium.
Very hard water can lead to scaling in the installations. In some situations, it can also complicate the preparation or administration of treatments via a dosing pump.
However, hard water is not automatically unfit for drinking. Its effects on equipment must be distinguished from any health effects.
4. Nitrates, nitrites and other chemical parameters
Depending on the origin of the resource, it may be relevant to test for nitrates, nitrites, ammonium, certain pesticides or other substances likely to be present around the water source.
The risks depend on the concentrations measured and the characteristics of the animals exposed.
The choice of analyses should therefore be tailored to the resource and carried out with the support of a qualified laboratory and, where necessary, the veterinarian or livestock technician.
Borehole water or mains water: what are the risks for a pig farm?
Where the water comes from directly influences which parameters need to be monitored.
When a farm is supplied by the public network, the water is subject to health monitoring upstream. This does not remove the need to monitor water quality within the farm's internal installations.
Pipes, tanks, drinkers and distribution points can alter the hygienic condition of the water after it arrives on site.
For a farm supplied by a private borehole or well, vigilance must also extend to the resource itself.
Depending on the geological and environmental context, groundwater can contain significant concentrations of iron, manganese, nitrates or other substances.
Protecting the water source is also essential. IFIP recommends, among other things, taking into account the proximity of potential sources of pollution, such as manure storage areas or land where effluent is spread.
The quality of borehole water can also change over time. A change in pumping conditions, a prolonged drought or certain weather events may justify new tests.
We explain these phenomena in detail in our article on the effects of drought on the quality of agricultural borehole water.
What warning signs should pig farmers look out for?
Certain signs may point to a problem with water quality, distribution or maintenance of the installations.
- An unusual drop in water consumption: this may indicate a problem with access, flow or temperature, or a change in the animals' health status.
- Drinkers that foul quickly: deposits may be associated with suspended solids, iron or manganese.
- Water that changes in appearance or smell: any such change should prompt a check on its cause.
- Pipes or filters that clog regularly: these may indicate a problem with the quality of the resource or the maintenance of the water lines.
- Recurring difficulties with dosing pumps: some physico-chemical parameters can affect the stability or delivery of administered products.
- Repeated health problems: among other veterinary investigations, these may justify checking water quality.
None of these signs is enough on its own to identify contamination. They are reasons to carry out a more thorough diagnosis.
The 6 priority parameters to analyze in pig farm water
For an initial diagnosis, several groups of parameters deserve particular attention:
- Microbiology: testing for contamination indicators, notably E. coli, coliforms and enterococci.
- Iron: assessing the risk of deposits and fouling.
- Manganese: checking for another potential cause of deposits in the network.
- pH: understanding the chemical characteristics of the water and the conditions for disinfection.
- Hardness: assessing the risk of scaling and possible interactions with certain treatments.
- Nitrates and nitrites: particularly relevant depending on the surroundings and the origin of the resource.
This list is a starting point for discussion, not a one-size-fits-all testing program. Other parameters may be needed depending on the history of the water source, the treatments used and the problems observed.
In particular, IFIP recommends a bacteriological analysis at least once a year of drinking water, with a sample representative of the water the animals actually drink, even when the farm uses mains water.
A physico-chemical analysis is also recommended to characterize the water, to be repeated whenever the resource or treatment changes.
How can water quality on a pig farm be improved over the long term?
The first step is to identify the problem precisely.
Water with high iron content does not necessarily require the same treatment as water with microbiological contamination, excessive hardness or a suspended solids problem.
It is therefore best to proceed in order:
- Identify where the water comes from and how it is used on the farm.
- Inspect the drinking water network, flow rates, distribution points and the condition of the pipes.
- Have the water analyzed for parameters suited to the context.
- Interpret the results with qualified professionals.
- Choose an appropriate treatment only once the parameters to be corrected have been identified.
- Check that the measures are effective and maintain a regular maintenance program.
Monitoring consumption can also become a valuable tool. IFIP has studied the value of tracking individual water and feed intake to help detect certain diseases early.
An unusual change in consumption should therefore not be ignored, even when the water looks perfectly clear.
Which filtration solution for a pig farm?
When an analysis reveals contaminants or particles that filtration can effectively reduce, centralized treatment may be considered.
FLX Water supports farms throughout this process, from studying the characteristics of the water to recommending a suitable solution.
The FLX Water Agricultural Solution is designed to treat the water used on farms, including pig farms.
It offers a nominal flow rate of up to 5 m³/h and combines several treatment stages, including stainless steel pre-filtration, activated carbon and high-precision filtration based on 0.1 µm hollow fibers combined with electro-adsorption.
Filtration works without added chemicals and without the unit needing its own power supply. However, where the resource does not have the necessary pressure, a suitable pumping system may be required.
The aim is to reduce the contaminants covered by the system's documented performance and to improve control over the quality of the water distributed on the farm.
But no filtration solution should be chosen without a prior assessment. Some parameters, such as nitrates or excessive hardness, may require additional or different technologies.
Likewise, filtration does not replace cleaning the water lines, maintaining the drinkers or biosecurity measures.
Quality water: a prevention lever for pig farming
Water quality is an integral part of pig farm management.
A suitable resource, available in sufficient quantity and distributed in good conditions, helps meet the animals' physiological needs and control the risks associated with drinking water.
Conversely, microbiological contamination, mineral deposits or network malfunctions can become health and technical risk factors.
The right approach is therefore to monitor the resource, analyze the water when necessary, maintain the installations and adapt treatment to the results obtained.
With its Agricultural Solution, FLX Water supports farmers who want to make water quality part of their prevention and farm management strategy.
Frequently asked questions
How much water does a pig drink per day?
Consumption varies with age, weight, physiological stage and housing conditions. It can range from a few liters per day for piglets to several dozen liters for a lactating sow.
Can poor water slow down pig growth?
Unsuitable or insufficiently available water can disrupt drinking and, indirectly, feed intake. The consequences depend on the cause and severity of the problem.
Should water be tested on a farm supplied by the public network?
Yes, monitoring remains relevant because quality can change within the internal installations. IFIP recommends, in particular, an annual bacteriological analysis representative of the water actually consumed by the animals.
Is iron in water a problem in pig farming?
High concentrations can promote deposits and fouling of equipment. Interpreting an analysis must take into account the concentration measured and the characteristics of the network.
Is a water filter enough to solve all drinking water problems?
No. Problems with flow, pressure, hardness, microbiological contamination or chemical composition do not all require the same treatment. A prior diagnosis is essential.
Sources
- IFIP – Fact sheet on water quality and biosecurity in pig farming: recommendations on microbiological monitoring, physico-chemical parameters, water sources and drinking water networks.
- IFIP – Drinking water quality on farms and its impact on treatments administered by dosing pump: effects of water characteristics on herd health, disinfection and treatment administration.
- IFIP – Audit of drinking water quality: microbiological risks, deposits, iron, manganese and maintenance of water lines.
- IFIP – Research on drinking water for pigs: water consumption, equipment and technical benchmarks in pig farming.
- IFIP – Individual water and feed intake for the early detection of diseases: the value of monitoring drinking behavior.
- MSD Veterinary Manual – Feeding Levels and Practices in Pigs: nutritional requirements, factors influencing intake and pig performance.
Solution recommandée
FiltraLife Agricultural Solution
Filtration de l'eau sans électricité ni produits chimiques. Réduit les impuretés, les goûts et les odeurs.
