Seaford Secondary College vs Tatachilla Lutheran College
A head-to-head comparison of two schools in South Australia, 5.4 km apart, using official ACARA 2025 data. Best value in each row is highlighted.
Seaford Secondary College
Seaford · Government high school · U, 7-12
829 students · ICSEA 962
Tatachilla Lutheran College
Mclaren Vale · Independent combined · R-12
1,103 students · ICSEA 1068
| Measure | Seaford Secondary College Seaford SA | Tatachilla Lutheran College Mclaren Vale SA |
|---|---|---|
| Success Index | 33 Lower 50% | 56 Top 50% |
| State rank (type) | #61 of 84 | #41 of 145 |
| National rank (type) | #1107 of 1,472 | #540 of 1,259 |
| Sector | Government | Independent |
| Type | Secondary | Combined |
| Year range | U, 7-12 | R-12 |
| Students | 829 | 1,103 |
| Girls / boys | 388 / 441 | 566 / 537 |
| Foundation intake | – | 51 |
| Year 7 cohort | 106 | 123 |
| Year 12 cohort | 104 | 102 |
| VCE median study score VCAA, latest year | – | – |
| VCE study scores 40+ | – | – |
| 5-year enrolment growth | +1% | +1% |
| ICSEA Average 1000 | 962 | 1068 |
| ICSEA percentile | 30th | 75th |
| Top SEA quarter | 5% | 25% |
| Bottom SEA quarter | 50% | 12% |
| Students per teacher | 13.3 | 12.5 |
| Teaching staff (FTE) | 62.5 | 88.2 |
| Non-teaching staff (FTE) | 39.1 | 42.6 |
| Language background other than English | 9% | 4% |
| Indigenous students | 7% | 2% |
| Suburb | Seaford 5169 | Mclaren Vale 5171 |
| Council area | Onkaparinga | Onkaparinga |
| Remoteness | Major Cities | Major Cities |
| Website | www.seafordhs.sa.edu.au | www.tatachilla.sa.edu.au/ |
The verdict
- •Tatachilla Lutheran College scores higher on the Success Index (55.6 vs 33.3).
- •Tatachilla Lutheran College has the higher ICSEA (1068 vs 962), indicating a more advantaged community.
- •Tatachilla Lutheran College has fewer students per teacher (12.5 vs 13.3).
- •Tatachilla Lutheran College is the larger school with 1,103 students compared with 829.
- •Seaford Secondary College is a government school while Tatachilla Lutheran College is an independent school, so fees and enrolment rules differ.
The Success Index summarises community advantage, resourcing and momentum from ACARA data. It does not measure teaching quality, results or fit. Methodology.
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Frequently asked questions
Is Seaford Secondary College better than Tatachilla Lutheran College?
On the Success Index, Tatachilla Lutheran College ranks higher (55.6 vs 33.3 out of 100). The index measures community advantage and momentum from ACARA data, not teaching quality, so visit both schools before deciding.
How far apart are Seaford Secondary College and Tatachilla Lutheran College?
About 5.4 km in a straight line, between Seaford and Mclaren Vale in South Australia.
Which has the better student-to-teacher ratio?
Seaford Secondary College has 13.3 students per full-time-equivalent teacher and Tatachilla Lutheran College has 12.5.
How do Seaford Secondary College and Tatachilla Lutheran College rank in SA?
Seaford Secondary College is 61st of 84 and Tatachilla Lutheran College is 41st of 145 among secondary schools in South Australia on the 2025 Success Index.