What Is Domain Authority and How Does It Affect Your Google Rankings?

The honest guide to a widely quoted, widely misunderstood SEO metric

If you've spent any time talking to an SEO agency, you've almost certainly heard the words 'domain authority.' It comes up in monthly reports. It's used to justify link-building campaigns. Some agencies stake their entire reporting strategy on it. And for many business owners, it sits in the back of their mind as a number they know they're supposed to care about but don't fully understand.

Here's the truth we tell every client who asks: domain authority is not a Google ranking factor. Google's own spokespeople have said so explicitly. The score doesn't live in Google's algorithm. It's a third-party metric created by Moz, a software company, to help marketers estimate website strength.

So does it matter? Yes — but not in the way most agencies explain it. The number itself is a proxy. What it represents — the quality and quantity of websites linking to yours — is genuinely important to Google. The mistake is confusing the proxy for the underlying signal.

This guide gives you the complete picture: what domain authority actually is, what it tells you, how it relates to real Google ranking signals, what a realistic score looks like for your business, and a practical 90-day plan for building the real thing behind the number.

The Short Answer: Domain Authority Is Not a Google Ranking Factor (But Still Matters)

Google's John Mueller has confirmed on multiple occasions that domain authority — as measured by Moz, Ahrefs, Semrush, or any other tool — is not something Google uses in its ranking algorithm. The company has its own proprietary system for evaluating website trustworthiness and link authority. Third-party tools don't have access to it.

This is not a trivial distinction. An agency that reports your DA score as a direct measure of your Google performance is, at best, using imprecise language. At worst, they're optimising for the score rather than the underlying signals that actually affect rankings.

That said, here's why domain authority still matters as a metric:

• It correlates with Google's real authority signals. Sites with high DA have usually earned it through exactly the kind of link profile Google rewards: genuine backlinks from relevant, reputable sources.
• It's a useful benchmarking tool. Comparing your DA to your direct competitors gives you a rough but functional picture of the authority gap you're facing for competitive keywords.
• It indicates backlink profile quality. A growing DA almost always reflects real improvements to your link profile — the underlying work that does move rankings.
• It helps set expectations. Understanding the logarithmic scale (more on this below) explains why going from DA 10 to DA 25 takes months but going from DA 55 to DA 65 might take years.

What Domain Authority Actually Is: The Moz Score Explained

Domain Authority is a metric created and maintained by Moz, an SEO software company. It was designed to predict how likely a website is to rank in search engine results pages, based primarily on the quality and quantity of inbound links.

The scale runs from 1 to 100. It is logarithmic rather than linear, which has important practical implications:

• Moving from DA 5 to DA 20 is relatively achievable with a few months of active link building
• Moving from DA 20 to DA 40 requires significantly more effort and time
• Moving from DA 60 to DA 70 requires sustained, high-quality link acquisition over years

This logarithmic structure means that the absolute number matters less than your position relative to your direct competitors. A DA of 22 competing in a market where most competitors sit between 15 and 28 is a very different situation from a DA of 22 trying to rank against national sites scoring 55+.

Moz calculates DA by analysing:

• The total number of unique root domains linking to your site (linking domains)
• The quality and authority of those linking domains (a link from a DA 70 site contributes more than ten links from DA 10 sites)
• The spam score of your backlink profile (toxic links drag the score down)
• MozRank and MozTrust calculations (Moz’s proprietary link analysis system)

Moz recalibrates its entire database periodically. When this happens, DA scores across the web can shift — sometimes significantly — without any actual change in your link profile. This is one of the most common reasons for unexplained DA drops, and it's a source of confusion for businesses who see their score change without having done anything different.

DA vs DR vs Authority Score: which tool, which metric?

Domain Authority is specifically Moz's metric, but every major SEO platform has its own equivalent. They measure similar concepts through different methodologies, and their scores are not directly comparable:

Our recommendation: don't switch tools mid-campaign or try to compare scores across platforms. Pick one, establish a baseline, and track change over time. Consistency of measurement matters more than which tool you choose. We primarily use Moz and Ahrefs in our client reporting, cross-referencing both for a fuller picture.

What is a good domain authority score for a small business?

The question we get asked most often by business owners is: 'What DA should we be aiming for?' The answer depends almost entirely on who you're competing against — not on any absolute benchmark.

The practical principle: before setting a DA target, check your top three to five Google competitors for your primary keywords. If they sit between DA 20 and DA 35, getting to DA 30 should be a realistic 12-month objective. If they're at DA 55+, that's a longer journey requiring a more aggressive off-page strategy — or a pivot toward lower-competition keyword segments where your current authority is already competitive.

What Google Actually Uses Instead: E-E-A-T and Link Authority Signals

While DA is a third-party approximation, Google has its own sophisticated system for evaluating website authority. Understanding what Google actually looks at helps explain why building genuine DA works — and why gaming the metric doesn't.

Google's authority evaluation is anchored in two interconnected systems:

PageRank and link graph analysis. Google's original innovation was treating links as votes of confidence. A link from a trusted, relevant website signals to Google that your content is credible. The quality, relevance, and authority of the sites linking to you matters more than quantity. This is why one link from a well-regarded industry publication can outweigh fifty links from low-quality directories.

E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness). Google's Search Quality Evaluator Guidelines outline a framework for assessing content quality and author credibility. E-E-A-T isn't a single algorithm — it's a set of signals Google uses to evaluate whether a site is a credible source on a given topic. Strong off-page authority (genuine backlinks, brand mentions, GBP signals) contributes directly to the 'Authoritativeness' and 'Trustworthiness' dimensions.

The relationship between DA and Google's real signals is this: a genuinely high DA site has almost always earned that score by doing the things Google rewards — publishing credible content, being linked to by relevant sources, and maintaining a clean technical profile. The score correlates with the underlying signals because it attempts to approximate the same concept.

Where the correlation breaks down is when DA is inflated artificially through link schemes. A site with a DA of 35 built on bought links and PBN schemes might have none of the underlying E-E-A-T signals Google actually values. Google's spam detection has become sophisticated enough to identify these patterns, and the penalty for manipulative link building — a manual action or algorithmic suppression — can take months or years to recover from.

How Domain Authority Affects Your Rankings in Practice

Domain authority affects rankings indirectly by determining which keywords are realistically within your competitive reach. It's not a switch that turns rankings on or off — it's a ceiling that expands as your authority grows.

Think of it as a permission system. A site with a DA of 18 has 'permission' from the search engine ecosystem to rank for low-competition, specific, and localised search terms — provided the on-page SEO and technical foundation are solid. That same site doesn't yet have the authority to compete for broad, nationally contested terms that sites with DA 50+ have been winning for years.

The practical implication for your SEO strategy: your keyword targeting should match your current authority level. Trying to rank for highly competitive terms before you have the domain authority to compete is like entering a heavyweight fight at featherweight. You can be technically perfect and still get outranked purely by authority. The right strategy is to identify and win the keywords your current DA can compete for, build authority through those wins, and then expand into harder terms as your authority grows.

The low-DA advantage: how new sites can still rank

Low domain authority is not a death sentence for organic visibility — particularly for local and niche businesses. There are real and reliable ways for low-DA sites to rank, and they represent the fastest path to early organic results:

• Long-tail and hyper-specific keywords. A search like 'accountant Cape Town SME tax planning' has far fewer competing pages than 'accountant Cape Town,' and many of those competing pages are on high-DA sites that aren't deeply optimised for that specific term. A well-crafted, on-point page on a DA 22 site can outrank a DA 55 site that only half-matches the intent.
• Local search and Google Business Profile. Local pack rankings are heavily influenced by proximity, GBP completeness, and reviews — factors where a local DA 20 business can outrank a national DA 60 competitor because it's more geographically relevant. This is the fastest path to visible results for service area businesses.
• Topical depth and relevance. A site with modest DA but deep, expert coverage of a narrow topic can outrank higher-DA generalist sites on specific queries. Google increasingly rewards genuine expertise over raw link authority for specialised informational content.

Why Your Domain Authority Dropped (And What to Do About It)

A DA drop is one of the more alarming events in an SEO campaign, particularly if it appears in a monthly report without explanation. Before panicking, it helps to know the five most common causes — because most of them are not what you'd expect.

1. Moz algorithm recalibration (most common, not your fault). Moz periodically updates how it calculates DA across its entire link index. When this happens, scores across the web can shift by five to fifteen points simultaneously. If your DA dropped at the same time as industry peers, this is almost certainly the cause. Check SEO forums and communities around the date of the drop for confirmation. The fix: nothing. Wait for the next recalibration, which typically brings scores back toward their previous levels.
2. Lost backlinks. If a high-authority site that was linking to you removes the link or takes down the page, your DA can drop. This is genuine and actionable. Use Moz or Ahrefs to check your 'lost backlinks' report for the period in question. Identify what was lost and, where possible, reach out to reclaim the link or build a replacement from a comparable source.
3. Toxic link penalties. If low-quality or manipulative links pointing to your site have been identified and actioned by Google — or if you've done a disavow file incorrectly — the resulting cleanup of your link profile can temporarily reduce your DA. This is generally a good-faith drop: removing toxic links is the right thing to do, and the score should recover once the profile normalises.
4. Relative score shift. Moz's algorithm is comparative. If many new high-authority sites enter the index simultaneously (which happens during major recalibrations), the scale can shift, making existing scores appear lower relative to the broader web. Your actual link profile hasn't changed; the benchmark has.
5. Technical issues blocking crawl. If Moz's crawler can't access your site properly — due to robots.txt changes, accidental noindex tags, or server issues — it can't fully evaluate your link profile and your DA may drop as a result. Check your site's crawl status in Google Search Console and cross-reference with any recent technical changes.

In our experience, the majority of unexplained DA drops are caused by Moz recalibrations rather than anything the business has done. If your organic traffic hasn't dropped in GA4 and Google Search Console impressions are stable, a DA drop is almost certainly a metric recalibration rather than a real-world authority loss.

How to Build Domain Authority: A Practical 90-Day Plan for SMEs

Building domain authority is not a shortcut game. It's an accumulation game. The businesses that compound their authority most effectively are those that execute consistently over months and years, not those that chase a quick score spike through tactics Google is designed to detect and penalise.

Here is the 90-day framework we use with new clients to establish an authority-building trajectory from the ground up.

The quality backlinks that actually move the needle for South African SMEs

Generic link-building advice — 'get backlinks from high-authority sites' — is too broad to be actionable. Here are the specific link sources that consistently produce results for South African SMEs, roughly ordered from easiest to more involved:

• Industry and professional association listings. If you're a registered member of an industry body, Chamber of Commerce, or professional association, a listing on their site is almost always available and carries genuine authority. SACAP, SAICA, SAIT, local BNI chapters — these are the links that signal to Google that you're a legitimate, verified business in your sector.
• Supplier and vendor directories. Many B2B suppliers maintain partner directories on their websites. If you use their products or services, ask to be listed. These are easy links that carry contextual relevance.
• Regional business directories. SA-specific directories like Brabys, Yellow Pages South Africa, Hotfrog SA, and Locanto are worth the 20 minutes each takes to set up. The links aren't high-power, but they contribute to NAP consistency and local citation signals.
• Local media and news sites. Reaching out to local business journalists with genuine news, thought leadership opinions, or data-driven content is one of the highest-impact link-building activities available. A mention in the Sunday Times Business section, News24, or a local community news site carries authority that can take months to replicate through other means.
• Guest articles on industry publications. Writing a substantive, non-promotional guest article for a respected industry blog or publication earns a contextually relevant link and builds credibility simultaneously. Focus on genuinely useful content rather than thinly veiled marketing pieces — editors can tell the difference.
• Strategic partner and client websites. If you work with other reputable businesses, ask about reciprocal or unidirectional mentions on each other's websites. A financial adviser linking to their accountant, a builder linking to their architect — these contextual business relationships produce some of the most natural, Google-friendly links available.

The tactics that will hurt you: a warning about shortcuts

The link-building industry has a long history of selling shortcuts that ultimately cause harm. If you're investing in SEO with any provider — agency or freelancer — it's worth knowing what to look out for:

• Paid links. Google's Webmaster Guidelines explicitly prohibit buying or selling links that pass PageRank. Paid link schemes are regularly identified and actioned by Google, sometimes causing significant and lasting ranking drops. Be sceptical of any provider promising a set number of backlinks for a fixed monthly fee without clarity on how those links will be acquired.
• Private Blog Networks (PBNs). PBNs are networks of fake or expired websites used solely to generate backlinks. They look real from the outside but have no genuine audience or organic authority. Google has become highly effective at detecting PBN patterns, and sites caught using them face manual penalties. The short-term DA boost isn't worth the long-term risk.
• Exact-match anchor text manipulation. Using your target keyword as anchor text on every inbound link ('best plumber Johannesburg') looks unnatural and manipulative. Natural link profiles have diverse anchor text: brand names, URLs, generic phrases, and descriptive variations. An over-optimised anchor text profile is a clear algorithmic red flag.
• Low-quality directory spam. Submitting to hundreds of irrelevant, low-quality global directories does more harm than good. These links contribute to spam score rather than authority. A small number of genuinely relevant, quality directories is worth more than a large quantity of meaningless ones.

One of our most common onboarding scenarios involves inheriting a client from a previous provider who ran a PBN link campaign. In one case, a Johannesburg logistics company had 340 backlinks from obvious PBN sites. Their DA was artificially inflated to 31, but they were ranking nowhere for target keywords. The cleanup process — disavowing the toxic links, stabilising the profile, rebuilding with quality links — took four months. By month six, their DA had settled at 24 (genuinely earned) and they were ranking on page one for their primary freight services keywords. Cleaning up bad link work is significantly harder than building good link work from scratch.

How to Track Domain Authority Progress in GA4 and Google Search Console

Tracking DA progress in isolation is a mistake. The score should always be viewed alongside real organic performance metrics — because the point of building authority is to rank for more keywords and generate more organic traffic and leads, not to achieve a particular DA number.

Here's the measurement framework we use to track whether an authority-building programme is actually working:

1. Referring domains in Google Search Console. GSC tracks the number of unique domains linking to your site over time. Navigate to Links > Top Linking Sites to see your inbound link profile. This is Google's own data on your links, not a third-party estimate. A consistent upward trend in unique referring domains is the clearest signal that your link-building activity is taking effect. Set a monthly reminder to check this number.
2. Organic impressions in GSC. As domain authority grows, Google starts serving your pages for more search queries — even before rankings improve. The Performance > Search Results report in GSC shows your total impressions over time. A rising impressions trend (particularly for new query types beyond your existing rankings) is an early indicator that authority growth is translating into broader visibility.
3. Average position for tracked keywords. Use GSC or a rank tracking tool (Moz, Ahrefs, Semrush, or a free tool like Google Search Console's Position Tracking) to monitor average position for your target keywords month over month. Authority growth typically first manifests as page-2 and page-3 rankings improving toward page one, before page-one positions consolidate and strengthen.
4. Organic traffic and organic leads in GA4. This is the ultimate business metric. Connect GA4 to GSC, ensure conversion tracking is set up for form submissions and key actions, and track organic sessions and organic conversions monthly. Authority growth should translate into measurable traffic and lead volume improvement within four to eight months of sustained link-building activity.
5. DA / DR trend (third-party tools). Check your Moz DA and Ahrefs DR monthly and log them alongside your organic metrics. If these scores are rising while organic traffic is also rising, you have confirmation that the underlying activity is genuinely building authority, not just the metric. If the score rises but traffic doesn't, something else is limiting your rankings — possibly on-page relevance or technical issues.

One practical tip: don't check DA more than once a month and don't make decisions based on single-month changes. Authority building is a long game. Meaningful DA movement typically becomes visible on a quarterly basis, not a weekly one. Quarterly reviews of all five metrics above will give you a far more accurate picture of whether the programme is on track than anxious weekly score-checking.

Frequently Asked Questions

Does domain authority directly affect Google rankings?

No — Moz's Domain Authority is a third-party metric that Google has explicitly confirmed it doesn't use in its algorithm. However, the underlying signals that determine your DA (quality backlinks from reputable sites, a clean link profile, topical relevance of referring domains) are genuine Google ranking factors. DA correlates with ranking performance because it attempts to approximate the same concept as Google's internal authority evaluation. The practical implication: building a genuinely strong backlink profile improves both your DA and your Google rankings, but optimising for the score alone without the underlying substance is counterproductive.

How long does it take to increase domain authority?

For a new or low-DA site (under 20), meaningful improvement is possible within three to six months with consistent, quality link-building activity. Moving from DA 25 to DA 40 typically takes 6 to 12 months. Beyond DA 50, progress slows significantly and requires sustained investment over years. Realistic expectations matter here: if a provider promises dramatic DA increases in weeks, the tactic is almost certainly a paid link scheme or PBN — which can inflate the metric temporarily while creating real Google risk. Genuine authority is built slowly and holds permanently.

What's the difference between domain authority and page authority?

Domain Authority (DA) measures the overall link strength of an entire website — all pages combined. Page Authority (PA) measures the link strength of a specific individual page. Both metrics come from Moz and use the same 1–100 logarithmic scale. A high-DA site can have individual pages with low PA if those specific pages have few inbound links. Conversely, a lower-DA site can have a high-PA page if it has attracted many links to that specific URL. For content strategy, PA matters more for individual page competitiveness — a well-linked specific page on a mid-DA site can outrank a generic page on a high-DA site for a specific keyword. For overall authority and competitive positioning, DA is the more relevant benchmark.

Why did my domain authority suddenly drop?

The most common cause — accounting for the majority of unexplained drops — is a Moz algorithm recalibration. Moz updates its scoring methodology periodically, causing scores across the entire web to shift simultaneously. If your organic traffic in GA4 and your impressions in Google Search Console haven't dropped, this is almost certainly the reason and requires no action. If the drop coincides with a site migration, a server issue, or a period when your site had crawl problems, Moz may have been unable to assess your link profile properly. Other genuine causes include lost backlinks from sites that removed your link or went offline, or a disavow file that removed links Moz was counting toward your score. Always cross-reference a DA drop against your organic performance data before drawing conclusions.

Can I rank on Google with a low domain authority?

Absolutely — and this is one of the most important truths for new and growing SMEs to internalise. Low DA does not prevent you from ranking; it limits which keywords are realistically within your competitive reach. A DA 18 site with excellent technical health, strong on-page optimisation, and precise keyword targeting for low-competition terms will consistently outrank a DA 18 site that's targeting nationally competitive terms. Local search is particularly forgiving: Google Business Profile authority, geographic relevance, and review signals can produce local pack visibility at almost any DA level. The strategy for low-DA sites is to win where the competition matches your current authority, build from those wins, and expand into harder terms as your DA grows.

Or download the 90-day DA Building Roadmap:

Free download → yoursite.co.za/da-roadmap

This is article 4 in our SEO Strategy & Fundamentals series.

Also in this series:

• Article 1: Why Your Website Isn't Ranking on Google: A Technical SEO Checklist → yoursite.co.za/blog/website-not-ranking-google
• Article 2: How Long Does SEO Take to Show Results? Realistic Timelines for SMEs → yoursite.co.za/blog/how-long-does-seo-take
• Article 3: On-Page vs Off-Page vs Technical SEO: What to Prioritise First → yoursite.co.za/blog/on-page-vs-off-page-vs-technical-seo

About the Author

Written by the SEO team at [Your Agency Name]. We’re a South African digital agency specialising in SEO, Google Analytics (GA4), web design, web development, and lead generation for SMEs. We’ve helped 150+ businesses build genuine search authority that generates consistent, measurable leads.

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