Quality & Safety Over 50 Years ofQuality Standards
Since 1976, Celtic Sea Salt® has been committed to preserving traditionally harvested mineral sea salts while holding ourselves to rigorous standards for testing, transparency, and verification.
We are passionate about every aspect of our salt—from where it comes from to how we validate what is inside every bag.
Every lot is independently analyzed to verify mineral content, purity, and safety.
Tested & Proven
Every Lot Independently Tested
Each production lot is analyzed by accredited third-party laboratories.
Testing includes:
• Mineral composition
• Sodium and sodium chloride levels
• Heavy metals
• Microbial safety
• Additional quality indicators
Our testing process allows us to understand both the natural variation of our salts and the consistency of our standards.
Sodium Content
Naturally Lower Sodium Chloride Levels
Pure sodium chloride contains 39.3% sodium. Because Celtic Sea Salt® salts retain naturally occurring minerals and moisture, they contain less sodium chloride than refined table salt.
| Salt Type | Sodium Content (typical range) | Implied Sodium Chloride Content |
|---|---|---|
| Celtic Fine Ground™ | 32.5% – 35.2% | 82.6% – 89.4% |
| Light Grey Celtic® | 29.2% – 34.2% | 74.4% – 86.9% |
Typical range represents mean ± one standard deviation across 2026 tests at two independent laboratories.
Table values represent all 2026 lot tests from both independent laboratories (Celtic Fine Ground™ n=18; Light Grey Celtic® n=31). Typical ranges represent mean ± one standard deviation. The chart displays the distribution of sodium results across all tested lots; the box represents the middle 50% of results, whiskers represent the full range, and the dashed gold line represents the mean. Pure sodium chloride reference is 39.3% sodium.
Chloride Cross-Check
An Additional Layer of Validation
Because salt contains sodium, chloride, and other naturally occurring minerals, chloride measurements provide another way to validate sodium chloride calculations.
By comparing results from separate analytical methods, we can confirm that reported values accurately represent the composition of our salts.
Key Minerals
Light Grey Celtic® and Celtic Fine Ground™ each have their own distinct mineral profile.
The minerals below represent those we routinely measure through independent laboratory testing.
| Mineral | Celtic Fine Ground™ (typical range, PPM) | Light Grey Celtic® (typical range, PPM) |
|---|---|---|
| Magnesium | 6,999 – 13,744 | 6,987 – 14,439 |
| Potassium | 2,857 – 5,242 | 2,738 – 5,449 |
| Calcium | 3,037 – 4,244 | 3,274 – 4,771 |
| Iron | 9.6 – 13.6 | 10.1 – 16.2 |
| Manganese | 2.1 – 3.0 | 1.0 – 6.8 |
Typical ranges represent mean ± one standard deviation across all 2026 laboratory results. Mineral values are calculated from repeated independent laboratory analyses: magnesium, potassium, and calcium include both laboratory datasets (n=18–32 per product), while iron and manganese are based on Light Labs assays (n=6–14 per product). Non-detect results are included as zero when calculating ranges. Moisture content and additional trace elements are reported on individual lot Certificates of Analysis (COAs).
Purity Testing
Screening for Heavy Metals
Every production lot is screened for four heavy metals — lead, arsenic, cadmium, and mercury — through independent accredited laboratories. Because these elements can naturally occur at trace levels in mineral-rich environments, we evaluate both detection levels and consistency across repeated testing.
Below are the 2026 results from all tested production lots.
| Element | Celtic Fine Ground™ — Median Value (Std Dev in parenthesis) | Light Grey Celtic® — Median Value (Std Dev in parenthesis) |
|---|---|---|
| Lead | Not Detected (Std Dev 42.5 PPB) | 58.5 PPB (Std Dev 47.0 PPB) |
| Arsenic | Not Detected (Std Dev 3.6 PPB) | Not Detected (Std Dev 10.4 PPB) |
| Cadmium | Not Detected (Std Dev 2.2 PPB) | Not Detected (Std Dev 1.6 PPB) |
| Mercury | Never detected | Never detected |
Results represent all 2026 heavy metal tests from two independent laboratories (Celtic Fine Ground™ n=24; Light Grey Celtic® n=39 per element). Median values and standard deviations are calculated across all results, with non-detect results included as zero. A “Not Detected” result means the element was below the laboratory’s detection limit; actual values may fall between zero and that limit. Detection limits vary by laboratory (Eurofins: 25–100 ppb; Light Labs: approximately 3–48 ppb).
Understanding Laboratory Testing
Salt is a complex mineral matrix. Accurate testing requires the right methods for each element being measured.
The Method Has to Fit the Element
Measuring a major component like sodium and measuring a trace contaminant like lead at parts-per-billion levels require different preparation, calibration, and analytical methods.
We work with our laboratories to ensure each measurement method is appropriate for the concentration range being evaluated.
Every Result Has a Range
Laboratory testing includes measurement uncertainty. Rather than relying on a single result, we evaluate repeated measurements across multiple samples and time periods.
This helps ensure published values represent the true characteristics of our salts.
Trust Comes From Redundancy
Repeat testing helps confirm that results are representative.
Some elements may vary around laboratory detection limits. By using multiple tests and analytical approaches, we gain a clearer understanding of each salt’s natural composition.
2026 Certificates of Analysis
Transparency by Lot
We believe customers, retailers, and partners should have access to the information behind our products.
Below are third-party laboratory reports for our 2026 production lots. Each report provides detailed analytical results, including mineral composition and purity testing.
The Certificates of Analysis (COAs) represent third-party laboratory testing for 2026 production lots. Each Eurofins report includes a complete panel of tested parameters for that sample, while Light Labs certificates are provided by individual assay. These reports demonstrate our testing standards, elemental composition, and quality verification process.
Laboratory reports are provided to showcase elemental ranges and testing standards. They do not indicate a connection between a specific consumer purchase and an individual production lot or production date.
Quality You Can Verify
The sea creates the mineral profile.
Traditional harvesting preserves it.
Independent laboratories verify it.