{"id":25043,"date":"2024-09-26T11:26:16","date_gmt":"2024-09-26T17:26:16","guid":{"rendered":"https:\/\/scotthomeinspection.com\/?p=25043"},"modified":"2024-09-26T11:26:16","modified_gmt":"2024-09-26T17:26:16","slug":"what-is-a-backflow-preventer","status":"publish","type":"post","link":"https:\/\/scotthomeinspection.com\/what-is-a-backflow-preventer\/","title":{"rendered":"What Is A Backflow Preventer?"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1144px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>A backflow preventer is one of the unsung heroes of our residential plumbing systems. These devices are crucial in preventing issues such as water contamination, sewage backups, or basement flooding. But what are they, and why are they so important? In this blog, we will get to the bottom of it!<\/p>\n<p><a href=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-scaled.jpg\"><img decoding=\"async\" class=\"wp-image-25075 aligncenter\" src=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-scaled.jpg\" alt=\"backflow preventer\" width=\"581\" height=\"387\" srcset=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-200x133.jpg 200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-300x200.jpg 300w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-400x267.jpg 400w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-600x400.jpg 600w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-768x512.jpg 768w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-800x533.jpg 800w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-1024x683.jpg 1024w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-1200x800.jpg 1200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-scaled.jpg 1440w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/1000084742-1536x1024.jpg 1536w\" sizes=\"(max-width: 581px) 100vw, 581px\" \/><\/a><\/p>\n<h2>What Causes Backflow?<\/h2>\n<p>To understand what a backflow preventer is, we must first understand what backflow is.<\/p>\n<p>In the simplest terms, &#8220;backflow&#8221; is liquid or waste flowing in the incorrect direction in which the system was designed. This can happen on supply and drain lines and can occur for different reasons.<\/p>\n<p>In pressured supply lines, things get a little more complicated. Water travels from a higher pressure to a lower pressure. This simple concept allows a city water department to distribute H2O to residential homes. Water is channeled through a main line at a high pressure, which branches off to individual houses, stepping down the pressure along the way.<\/p>\n<p>But on certain rare occasions, the downstream water pressure may become higher than the pressure from the main, causing the water to change directions, also known as <a href=\"https:\/\/www.cityofjackson.org\/354\/What-is-Backflow#:~:text=Put%20plainly%2C%20backflow%20is%20the,to%20a%20lawn%20irrigation%20system\" target=\"_blank\" rel=\"noopener\">backflow.<\/a> When the normal flow of water has reversed, serious issues can arise, as it can draw potentially contaminated water back into a potable water line. How do we avoid this issue? In the comes the backflow preventer!<\/p>\n<h2>What Is A Backflow Preventer?<\/h2>\n<p>A <a href=\"https:\/\/www.freshwatersystems.com\/blogs\/blog\/what-is-a-backflow-prevention-device-and-how-does-it-work?srsltid=AfmBOor_oOzUu-HoQ0IMwav2jXRCMHvixiwU7SrsbcjNIwhuANaFd1bO\" target=\"_blank\" rel=\"noopener\">backflow preventer (or BFP)<\/a> is a valve that has one simple function &#8211; allowing liquid to flow one direction, and stopping it from flowing in the opposite direction. There are several different types of these devices, and they are generally utilized in two main settings: irrigation systems and drainage systems.<\/p>\n<div id=\"attachment_25057\" style=\"width: 462px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-25057\" class=\"size-full wp-image-25057\" src=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb.png\" alt=\"backflow preventer\" width=\"452\" height=\"236\" srcset=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb-200x104.png 200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb-300x157.png 300w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb-400x209.png 400w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/pathoftravelweb.png 452w\" sizes=\"(max-width: 452px) 100vw, 452px\" \/><\/a><p id=\"caption-attachment-25057\" class=\"wp-caption-text\">Image sourced from: <a href=\"https:\/\/www.pacificbackflow.com\/backflow\/backflow_operation.php\" target=\"_blank\" rel=\"noopener\">https:\/\/www.pacificbackflow.com<\/a><\/p><\/div>\n<h2>Backflow Preventers on Irrigation Systems<\/h2>\n<p>If you have a sprinkler system at home, you likely have a backflow preventer. Being that irrigation systems are often buried and exposed to outdoor elements, it is possible for contaminants such as chemicals or waste to find their way into the irrigation lines.<\/p>\n<p>For instance, you may have pets that access your lawn to do their business. Or maybe you use fertilizer, pesticides or weed killer. Rain can wash all of these contaminants into the soil. And in the case where negative pressure pulls liquids back into your irrigation lines, you now all of a sudden have contaminated liquid traveling back toward your potable water supply. But, as you can guess, the backflow preventer will save the day! They are installed between your fresh water supply and the main irrigation line, effectively keeping the two lines separate.<\/p>\n<p>These apparatuses are such an important safeguard, that <a href=\"https:\/\/cdphe.colorado.gov\/bpccc\" target=\"_blank\" rel=\"noopener\">Colorado building code<\/a> requires them in most setups involving irrigation.<\/p>\n<div id=\"attachment_25081\" style=\"width: 657px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly.jpg\"><img decoding=\"async\" aria-describedby=\"caption-attachment-25081\" class=\" wp-image-25081\" src=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly.jpg\" alt=\"\" width=\"647\" height=\"262\" srcset=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-200x81.jpg 200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-300x122.jpg 300w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-400x162.jpg 400w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-600x243.jpg 600w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-669x272.jpg 669w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly-768x311.jpg 768w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/check-valve-assembly.jpg 800w\" sizes=\"(max-width: 647px) 100vw, 647px\" \/><\/a><p id=\"caption-attachment-25081\" class=\"wp-caption-text\">This diagram illustrates the double check style valve BFP, generally used on larger irrigation systems. Image sourced from:<a href=\"https:\/\/bethpagewater.com\/Regulations\/Backflow\" target=\"_blank\" rel=\"noopener\"> https:\/\/bethpagewater.com<\/a><\/p><\/div>\n<p>During our standard inspections, we always test the sprinkler systems (<a href=\"https:\/\/scotthomeinspection.com\/lawn-sprinkler-winterization\/\" target=\"_blank\" rel=\"noopener\">when the season permits<\/a>). While running the sprinklers, our inspectors make sure that BFPs are properly installed and free of any leaks, damage or defects. We usually come across Pressure Vacuum Breaker (PVB) backflow preventers, like the one shown below. This style of device is most commonly found in residential homes with smaller irrigation systems.<\/p>\n<p>Note that, while we do conduct this general BFP inspection, we are not plumbing professionals. And it is recommended to have your backflow preventer tested annually by a qualified pro.<\/p>\n<div id=\"attachment_25074\" style=\"width: 736px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-scaled.jpg\"><img decoding=\"async\" aria-describedby=\"caption-attachment-25074\" class=\"wp-image-25074\" src=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-scaled.jpg\" alt=\"backflow preventer\" width=\"726\" height=\"484\" srcset=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-200x133.jpg 200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-300x200.jpg 300w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-400x267.jpg 400w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-600x400.jpg 600w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-768x512.jpg 768w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-800x533.jpg 800w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-1024x683.jpg 1024w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-1200x800.jpg 1200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-scaled.jpg 1440w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/2024-09-09-12_57_34_186-1-1536x1024.jpg 1536w\" sizes=\"(max-width: 726px) 100vw, 726px\" \/><\/a><p id=\"caption-attachment-25074\" class=\"wp-caption-text\">Pressure Vacuum Breaker (PVB) backflow preventer<\/p><\/div>\n<h2>Backflow Preventers on Drainage Systems<\/h2>\n<p>Backflow preventers in drainage pipes, also know as <a href=\"https:\/\/www.squareone.ca\/resource-centres\/getting-to-know-your-home\/backwater-valve\" target=\"_blank\" rel=\"noopener\">backwater valves<\/a>, are constructed differently than ones used for irrigation. However, the same concept applies. Water can only travel one way. As the diagram below illustrates, this device can be installed seamlessly on the sewer line of a home. If water is flowing in the correct direction, the flap will remain in a downward position, allowing all waste and liquid to pass. However, if the flow reverses, the flap will float to its upward position, effectively obstructing any backflow of sewage.<\/p>\n<div id=\"attachment_25064\" style=\"width: 535px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve.jpg\"><img decoding=\"async\" aria-describedby=\"caption-attachment-25064\" class=\" wp-image-25064\" src=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve.jpg\" alt=\"\" width=\"525\" height=\"536\" srcset=\"https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve-66x66.jpg 66w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve-200x204.jpg 200w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve-294x300.jpg 294w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve-400x408.jpg 400w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve-600x613.jpg 600w, https:\/\/scotthomeinspection.com\/wp-content\/uploads\/2024\/09\/img-backwater-valve.jpg 661w\" sizes=\"(max-width: 525px) 100vw, 525px\" \/><\/a><p id=\"caption-attachment-25064\" class=\"wp-caption-text\">Image sourced from: <a href=\"https:\/\/www.squareone.ca\/resource-centres\/getting-to-know-your-home\/backwater-valve\" target=\"_blank\" rel=\"noopener\">https:\/\/www.squareone.ca<\/a><\/p><\/div>\n<p>These devices are especially effective in areas susceptible to flooding or below the municipal sewer main. In the case that a heavy rainfall occurs or there is a blockage in the municipal line, it will help to prevent any serious flooding from occurring in the basement of the home.<\/p>\n<p>During our <a href=\"https:\/\/scotthomeinspection.com\/\" target=\"_blank\" rel=\"noopener\">standard inspections<\/a>, we are able to inspect these valves when they are readily available. Unfortunately, they are often under ground or connected to an outside sweep. However, if we can see it, we ask a few questions. Is the clean-out cap intact and in good condition? Is the area free of any visible leaks or damage?<\/p>\n<p>During our <a href=\"https:\/\/scotthomeinspection.com\/sewer-scope\/\" target=\"_blank\" rel=\"noopener\">sewer scope inspections<\/a>, our inspectors are often able to see the BFP from within the pipe. We are not experts on these devices, but we will be sure to make note when they are present. If there is an access point before the device, our technicians are able to scope up the BF preventer. We can also inspect the line after the valve, if any accessible clean outs are available.<\/p>\n<p>We, unfortunately, cannot scope through the valve as it can cause damage to our sewer scope camera and the valve. This can make scoping a line with a backflow preventer tricky as they aren&#8217;t always installed in the most ideal spot.<\/p>\n<blockquote>\n<p>For more information about our sewer scope inspections, <a href=\"https:\/\/scotthomeinspection.com\/sewer-scope\/\" target=\"_blank\" rel=\"noopener\">visit us online.<\/a><\/p>\n<\/blockquote>\n<h2>Conclusion<\/h2>\n<p>As you can see, backflow preventers are essential devices in both irrigation and drainage systems. They defend the clean water supply and protect buildings from water contamination and damage, making them a must in many household settings!<\/p>\n<p>If you have any further questions about backflow preventers, don&#8217;t hesitate to reach out to us through our\u00a0<em><a href=\"https:\/\/scotthomeinspection.com\/ask-your-inspector\/\" target=\"_blank\" rel=\"noopener\">Ask Your Inspector<\/a>\u00a0<\/em>program.<\/p>\n<h2>In need of home inspection services? Try Scott Home Services!<\/h2>\n<p>Scott Home Services is a veteran home inspection company, and we have proudly served the Colorado Front Range for over 18 years. We offer a long list of inspection services, including standard home inspections, radon testing, water quality testing, pest inspections and more!<\/p>\n<p><a href=\"https:\/\/scotthomeinspection.com\/inspection-services\/\" target=\"_blank\" rel=\"noopener\">Visit us online<\/a> to learn more, or <a href=\"https:\/\/scotthomeinspection.com\/scheduling-options\/\" target=\"_blank\" rel=\"noopener\">contact us<\/a> to book your services today.<\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":18,"featured_media":25078,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4572,5136],"tags":[5356,5357,4088,4087,5185],"class_list":["post-25043","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-back-to-basics","category-plumbing","tag-backflow-preventer","tag-irrigation","tag-sewer-line","tag-sewer-scope-inspection","tag-sprinkler-system"],"nelio_content":{"autoShareEndMode":"never","automationSources":{"useCustomSentences":false,"customSentences":[]},"efiAlt":"","efiUrl":"","followers":[18],"highlights":[],"isAutoShareEnabled":true,"networkImageIds":[],"permalinkQueryArgs":[],"series":[],"suggestedReferences":[]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.1 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is A Backflow Preventer? - Scott Home Inspection<\/title>\n<meta name=\"description\" content=\"A backflow preventer is a crucial device that can help to protect a home from water contamination, sewage backups and flooding. 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