Drinking water quality
What's in Rancho Cucamonga, CA tap water
24 contaminants were measured in the Rancho Cucamonga, CA water system's most recent annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine | 0.2–1.39 mg/LRange | 4 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5 | 0–33 ug/LRange | 60 ug/LMCL | Approaching the limit |
| Perchlorate | 0–2.9 ug/LRange | 6 ug/LMCL | Within the limit |
| TTHM | 0–110 ug/LRange | 80 ug/LMCL | At or above the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chloride | 0–52 mg/LRange | 500 mg/LMCL | Within the limit |
| Fluoride | 0.085–0.44 mg/LRange | 2 mg/LMCL | Within the limit |
| Nitrate | 0–6.2 mg/LRange | 10 mg/LMCL | Approaching the limit |
| Sulfate | 8.6–71 mg/LRange | 500 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, Total | 1.8–5.3 ug/LRange | 10 ug/LMCL | Approaching the limit |
| Copper | 0.13 mg/LRange | 1.3 mg/LMCL | Within the limit |
| Lead | 0 ug/LRange | 15 ug/LMCL | None detected |
| Sodium | 7.5–39 mg/LRange | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli) | 0Average | 0MCL | None detected |
| Total Coliform | 0–1 %Range | 0 %PHG | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Color | 0–5Range | 15MCL | Within the limit |
| Hardness | 89–191 mg/LRange | None set | Detected — no federal limit |
| Odor | 0–2Range | 3MCL | Approaching the limit |
| Specific Conductance | 230–460 uS/cmRange | 1600 uS/cmMCL | Within the limit |
| TOC | 0.47–3.6 mg/LRange | None set | Detected — no federal limit |
| Total Dissolved Solids | 8.3–380 mg/LRange | 1000 mg/LMCL | Within the limit |
| Turbidity | 100Range | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined Radium | 0–1.03 pCi/LRange | 5 pCi/LMCL | Within the limit |
| Uranium | 0–4.9 pCi/LRange | 20 pCi/LMCL | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| DBCP | 0–23 ng/LRange | 200 ng/LMCL | Within the limit |
Every figure here is transcribed verbatim from Rancho Cucamonga, CA's annual Consumer Confidence Report, cross-checked by a second model, and approved by a person before publishing. Numbers are the utility's own — a water-quality report covers an entire service area, not a single address.