Drinking water quality · 2023
· Verified
· PWSID CA3710023
What's in Santa Fe I.d. — Rancho Santa Fe, Ca, CA tap water
2 contaminants in Santa Fe I.d. — Rancho Santa Fe, Ca, CA's water sat at or above a federal limit, led by Chlorine at 2.5x the limit.
- !2 contaminants at or above a federal limit — worst is Chlorine at 2.5x
- !14 of 27 core regulated contaminants reported — 13 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −41 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −8 core regulated contaminants never reported (14/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Chlorine2.5× the federal limit0–10 mg/L · limit 4 mg/L
Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- TTHM1.1× the federal limit11–85 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
+41 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Chloramine | 2.49–3.01 mg/L | 4 mg/L |
| PFOA | 2.4–2.8 ng/L | 4 ng/L |
| Copper | 0.83 mg/L | 1.3 mg/L |
| Chlorite | 0.39–0.6 mg/L | 1 mg/L |
| PFOS | 0–2.1 ng/L | 4 ng/L |
| HAA5 | 3.5–20 ug/L | 60 ug/L |
| Arsenic | 0–1.5 ug/L | 10 ug/L |
| Combined Radium | 0.59 pCi/L | 5 pCi/L |
| Bromochloroacetic acid | 6.3 ug/L | 60 ug/L |
| Dichloroacetic acid | 5.3 ug/L | 60 ug/L |
| Fluoride | 0.27–0.33 mg/L | 4 mg/L |
| Dibromoacetic acid | 4.7 ug/L | 60 ug/L |
| Nitrate | 0.75 mg/L | 10 mg/L |
| Trichloroacetic acid | 3.925 ug/L | 60 ug/L |
| Barium | 75–110 ug/L | 2000 ug/L |
| Gross Alpha | 0.2–0.34 pCi/L | 15 pCi/L |
| Monobromoacetic acid | 1 ug/L | 60 ug/L |
| Bromodichloromethane | 13.96 ug/L | — |
| Bromoform | 4.2 ug/L | — |
| Chlorate | 459 ug/L | — |
| Chloroform | 11.5 ug/L | — |
| Dibromochloromethane | 14.14 ug/L | — |
| Perchlorate | 0.84 ug/L | — |
| Aluminum | 0–46 ug/L | — |
| Boron | 0.13 mg/L | — |
| Calcium | 65 mg/L | — |
| Chromium, Hexavalent | 0.02–0.048 ug/L | — |
| Lead | 0 ug/L | 15 ug/L |
| Lithium | 30.6 ug/L | — |
| Magnesium | 27.75 mg/L | — |
| Potassium | 5.2 mg/L | — |
| Vanadium | 1.03 ug/L | — |
| Escherichia coli (E. coli) | 0 | — |
| Total Coliform | 3 | — |
| Perfluorobutanesulfonic acid | 2.2 ng/L | — |
| Perfluorohexanoic acid | 2.6 ng/L | — |
| Perfluoropentanoic acid | 1 ng/L | — |
| Alkalinity | 125 mg/L | — |
| Bicarbonate | 125 mg/L | — |
| Hardness | 162.5 mg/L | — |
| Gross Beta Particle Activity | 6.01–7.7 pCi/L | — |
What this report doesn't tell you
13 of the 27 contaminants a community water system normally reports do not appear anywhere in Santa Fe I.d. — Rancho Santa Fe, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.