For the main water supply line, you should use Schedule 40 PVC for outdoor underground lines, or CPVC for indoor hot and cold potable water. Ensure the pipe is marked NSF-61, which certifies it is safe for drinking water.
Schedule 40 is the most common PVC type. Schedule 80 PVC is thicker and stronger, which enables it to handle higher pressures. Usually, PVC is only used for cold water pipes since hot water can eventually break down the plastic material.
Schedule 40 PVC is safe and approved for drinking water, provided it is specifically certified and used exclusively for cold water.
Yes, you can absolutely use Schedule 80 PVC for water. It is a highly durable, thick-walled, pressure-rated pipe commonly used for high-pressure water systems, water mains, irrigation, and industrial applications.
CPVC pipes
As a result, CPVC pipes are often used for hot and cold water lines in both residential and commercial buildings. CPVC pipes are used for transporting drinking water as they do not leach harmful chemicals into the water.
Pipes not recommended for water lines—especially for drinking water—include lead (severe health hazards), polybutylene (prone to sudden, catastrophic ruptures), galvanized steel (susceptible to internal rusting and restricted water flow), and unplasticized PVC (not suited for high water temperatures).
Yes, Schedule 80 PVC is significantly stronger than Schedule 40 PVC. It is designed with a thicker wall, making it more durable, better at resisting physical impacts, and capable of withstanding much higher internal water pressures.
Standard PVC is rarely used for indoor water lines because it cannot handle hot water, has strict temperature and pressure limitations, and is too brittle to safely route inside walls. Instead, modern plumbing codes require specialized alternatives.
Schedule 80 pipe features a thicker wall designed for high-pressure industrial applications. However, this extra thickness introduces specific trade-offs: it reduces the pipe's internal flow capacity, increases material and installation costs, adds significant physical weight, and can create flow restrictions.
To quickly tell if PVC is Schedule 40 or 80, check the printed label on the pipe, look at the color (Schedule 40 is usually white, while Schedule 80 is dark gray), or measure the wall thickness—Schedule 80 has a noticeably thicker wall and a smaller inside diameter.
For unpressurized drain lines, you can generally run water after 15 to 30 minutes. However, for pressurized water lines (like main water lines or pool pumps), you should wait a minimum of 2 hours, though waiting 24 hours is recommended for high-pressure systems and cold temperatures.
Chlorinated polyvinyl chloride (CPVC) is falling out of favor in modern plumbing because it becomes brittle over time, making it prone to sudden leaks and breakage. Additionally, the chemical adhesive used on its joints can degrade, and the rigid material is susceptible to chemical reactions with common household materials and fire-retardant foams.
Neither PEX nor PVC is universally "better" because they are designed for entirely different plumbing jobs. Use PEX for indoor water supply lines and PVC for drainage, vents, and outdoor uses. PEX handles pressure, temperature, and freezing, while PVC is rigid, cost-effective, and handles large volumes of wastewater.
PMRs for malignancies of the stomach, kidney, brain, and lymphopoietic system were also elevated, especially among plumbers. Chronic rheumatic heart disease, emphysema, liver cirrhosis, and all external causes of death were the major non-cancer causes with significantly elevated PMRs.
Plumbers primarily use Schedule 40 PVC, which is standard for most residential drain, waste, and vent (DWV) lines. For applications requiring different properties or performance levels, they rely on three other distinct types of polyvinyl chloride.
In plumbing, the "135-degree rule" is a code standard that dictates how much a horizontal drain pipe can bend or change direction. It limits the total cumulative angle of pipe fittings before a system requires an access point (cleanout) or must be vented, ensuring proper flow and preventing chronic clogs.
Schedule 80 is more expensive than Schedule 40. Because Schedule 80 has thicker walls, it requires more raw material (whether plastic or steel) to manufacture, making it roughly 20…50% pricier than Schedule 40, depending on the specific pipe size and manufacturer.
Schedule 80 pipe is heavier.
Schedule 80 PVC is more expensive than standard Schedule 40 primarily because of its thicker walls. This design requires significantly more raw material, longer manufacturing times, and higher shipping costs.
Vinegar is generally safe for PVC pipes in small, infrequent amounts, but overusing it can degrade the material and weaken rubber seals or joints over time. While it won't melt or corrode PVC like chemical drain cleaners might, it is also highly ineffective at clearing hard clogs.
PVC water pipes are highly durable and have an expected lifespan of 50 to 100 years, making them a standard choice for modern plumbing and water distribution.
The purple stuff plumbers use is purple PVC/CPVC primer, often manufactured by brands like Oatey. It is not glue, but a cleaner and softener applied to plastic pipes before cementing to ensure a secure, leak-free, and code-compliant weld. Its purple dye provides visible proof to inspectors that the pipe was properly prepared.
Schedule 80 PVC pipe is engineered for heavy-duty, high-pressure, and highly corrosive applications. Recognized by its dark gray color, it features thicker walls than the more common residential Schedule 40, allowing it to withstand higher fluid pressures and severe physical impacts.
Yes, Schedule 80 pipe is consistently more expensive than Schedule 40, typically costing 25% to 50% more depending on the material.
You need Schedule 40 PVC for most standard residential plumbing and electrical projects. It is the most common, cost-effective choice for general water supply, drainage, irrigation, and standard underground conduit.