How Salta Validates Nigerian School Contact Data

Why data quality is the whole game in Nigerian schools

The Nigerian private K-12 market is enormous and highly fragmented — tens of thousands of nursery, primary and secondary schools, most of them independent, family-run or part of small chains. There is no single clean registry you can buy. School lines change hands, a proprietor's personal mobile doubles as the admissions desk, and the person who actually signs off on a uniform or software contract is rarely the one who answers a generic info@ address.

That fragmentation is exactly why generic lead lists fail here. A list scraped once and never touched goes stale fast: numbers get reassigned, schools rebrand, term-time contacts differ from holiday contacts. For a vendor paying per outreach attempt, every bounced email and dead dial is wasted money and a dent in your sender reputation.

Salta's answer is to treat the contact registry as a living asset we maintain, not a file we sell once. Customers get recurring, credit-based access to the maintained registry — so the validation work described below is ongoing, not a one-time pass that decays the day after you download it.

Step 1 — Sourcing and structuring the raw record

Every contact begins as a school institution record. We map the institution first — name, type (nursery, primary, secondary or combined), location down to state and locality — so that a phone number or email is never floating free of context. A number you can't tie to a specific, identifiable school is a number you can't trust, and we don't keep it.

From the institution record we work toward the decision-maker layer: the proprietor, head of school or the named person who controls purchasing. Reaching that person — rather than a switchboard or a front desk — is the entire point. A contact that only gets you to a gate is not a sellable contact in our model.

Raw inputs are normalised into a consistent structure before anything else happens: phone numbers reformatted to a standard Nigerian dialling format, names and titles cleaned, fields typed and labelled. Standardisation is what makes the later validation and de-duplication steps reliable rather than guesswork.

Step 2 — De-duplication and cleaning

Fragmented sources mean the same school often shows up several times — a slightly different spelling, an old name alongside a new one, a branch listed as if it were a separate institution. Before validation we de-duplicate, collapsing these into a single canonical record so you are never charged a credit twice for what is really one school, and never sending the same proprietor three near-identical emails.

Cleaning removes the obvious noise: placeholder numbers, malformed entries, test addresses, fields that are clearly junk. Where a record is ambiguous — two plausible numbers and no way to tell which is current, or a name that can't be reconciled — we apply a delete-don't-guess rule. We would rather drop a doubtful record than pass a guess off to you as a fact.

This is also where the headline numbers shrink, on purpose. The gap between 28,000+ mapped institutions and 6,500+ phone-validated contacts is the de-duplication and validation funnel doing its job. The catalogue size is an internal figure; the count that matters to you is how many contacts actually clear the bar.

Step 3 — Phone and email validation

Phone validation runs on two levels. First, format: the number has to be a structurally valid Nigerian mobile or landline once normalised. Second, carrier: we check the number against carrier data so we are confident the line is a real, allocated number on a live network — not a typo, not a long-disconnected range. A number that fails either level does not count toward the 6,500+ phone-validated total.

Email validation centres on MX checks — confirming the domain actually has mail-exchange records and can receive mail — alongside syntax and domain sanity checks, so generic, malformed or non-deliverable addresses are flagged out. To be clear about what this is and isn't: emails are MX-checked and deduped, not opened and confirmed person-by-person. We say validated, never verified, because we will not imply a level of certainty we haven't earned.

A premium contact — there are 1,000+ of them — is one that clears both bars: a validated phone and a validated email tied to the same identified decision-maker. Standard contacts carry a validated email, basic contacts a validated phone. The tiering exists so you always know precisely what you're paying a credit to reach.

Step 4 — Confidence scoring and tiers

Validation isn't strictly pass/fail; some records are stronger than others. We attach a confidence signal to contacts based on how cleanly they came through sourcing, cross-referencing and validation — how recent the data is, how well sources agree, whether the decision-maker is clearly named. This lets you prioritise your highest-confidence contacts first rather than treating every row as equal.

Confidence scoring pairs with the tier system. Premium, standard and basic tell you what channels you can reach a school on; the confidence signal tells you how much weight to put behind a given record. Together they let a vendor plan outreach intelligently — leading with premium, high-confidence contacts and sequencing the rest.

Crucially, an invalid contact never counts and never gets quietly upgraded to fill a quota. If a contact fails validation it is flagged and excluded from the sellable counts, full stop. That is what 'never ship a junk contact' means in practice.

Step 5 — Keeping contacts current

Validation at a single point in time isn't enough in a market this dynamic, which is why Salta is built as recurring access to a maintained registry rather than a one-off list. As the database is re-checked and enriched over time, the records you reach through Salta reflect the current state of the registry — not a snapshot frozen on the day you first subscribed.

Because the registry is Salta's retained asset, the incentive is aligned with yours: a contact that goes stale and bounces is a problem we want to catch and fix, because the same record serves every customer who reaches it. Re-validation, re-de-duplication and continued enrichment are part of maintaining the asset, not optional extras.

You can see how this maps to live institutions by browsing our /schools directory, and you can read about how the access model works in our other guides on credit-based access and on reaching school decision-makers. The validation discipline described here is what sits underneath every contact you'll find there.

Frequently asked questions