# Rubio Canon Land & Water Association — Altadena, Ca, CA — Drinking Water Quality (2020)

> Contaminant levels for the Rubio Canon Land & Water Association — Altadena, Ca, CA public water system from its 2020 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/rubio-canon-land-water-association-altadena-ca/2020
- JSON API: https://www.thewatermap.com/api/water/ca/rubio-canon-land-water-association-altadena-ca/2020
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2020
- Contaminants measured: 28
- Contaminants with a federal limit: 9
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| HAA5 | Disinfection byproducts | 7.31 ug/L (Average) | Average Amount | No federal limit | Within the limit |
| Perchlorate | Disinfection byproducts | 2.08 ug/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| TTHM | Disinfection byproducts | 28 ug/L (Average) | Average Amount | No federal limit | Within the limit |
| Chloride | Inorganic chemicals | 96 mg/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Fluoride | Inorganic chemicals | 0.78 mg/L (Average) | Average Amount | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 5.4 mg/L (Average) | Average Amount | 10 mg/L (MCL) | Within the limit |
| Sulfate | Inorganic chemicals | 219 mg/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Aluminum | Metals | 148 ug/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Arsenic | Metals | Not detected ug/L (Average) | Average Amount | No federal limit | None detected |
| Boron | Metals | 100 ug/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Chromium, Hexavalent | Metals | Not detected ug/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Copper | Metals | 0.44 mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | Within the limit |
| Iron | Metals | Not detected ug/L (Average) | Average Amount | No federal limit | None detected |
| Lead | Metals | Not detected mg/L (90th percentile) | At the tap | 0.015 mg/L (Action level) | None detected |
| Manganese | Metals | Not detected ug/L (Range) | System-wide | No federal limit | None detected |
| Sodium | Metals | 24 mg/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Vanadium | Metals | 3.2 ug/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Zinc | Metals | Not detected mg/L (Average) | Average Amount | No federal limit | None detected |
| Chlorine Total | Other | 2.4 mg/L (Average) | Average Amount | 4 mg/L (MCL) | Within the limit |
| Radium 226 228 | Other | Not detected pCi/L (Range) | System-wide | 5 pCi/L (MCL) | None detected |
| Hardness | Physical & aggregate | 380 mg/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Specific Conductance | Physical & aggregate | 964 (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Total Dissolved Solids | Physical & aggregate | 604 mg/L (Average) | Average Amount | No federal limit | Detected — no federal limit |
| Gross Alpha | Radionuclides | 8.65 pCi/L (Average) | Average Amount | 15 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | 6.86 pCi/L (Average) | Average Amount | 20 pCi/L (MCL) | Detected — no federal limit |
| 1,2,3-TCP | VOCs & pesticides | Not detected ug/L (Range) | System-wide | No federal limit | None detected |
| MTBE | VOCs & pesticides | Not detected ug/L (Average) | Average Amount | No federal limit | None detected |
| Tetrachloroethylene | VOCs & pesticides | 3.25 ug/L (Average) | Average Amount | 5 ug/L (MCL) | Within the limit |

## What these contaminants are

- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **Perchlorate** — A chemical used in rocket fuel and fireworks that can also form during disinfection. Can interfere with thyroid hormone production; has no national enforceable limit but is regulated in some states.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Chloride** — A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Sulfate** — A naturally occurring mineral from rock and soil. No health-based federal limit; high levels can have a laxative effect and a bitter taste.
- **Aluminum** — A common element sometimes used as a treatment coagulant. Regulated only as a secondary (cosmetic) standard; high levels can discolor water.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **Boron** — A naturally occurring element from rock and soil. No enforceable federal limit; the EPA has issued a health advisory level.
- **Chromium, Hexavalent** — Hexavalent chromium ('chromium-6') — the more toxic form of chromium. A known carcinogen by inhalation; regulated nationally only within the total-chromium limit, with stricter limits in some states.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Iron** — A naturally occurring metal common in groundwater. Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Manganese** — A naturally occurring metal from soil and rock. No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **Zinc** — A naturally occurring metal that can also enter water from corroding pipes. Regulated only as a secondary (cosmetic) standard; high levels cause a metallic taste.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **Specific Conductance** — A measure of how well water conducts electricity, which tracks dissolved mineral content. Not federally regulated for health; used as a proxy for total dissolved solids.
- **Total Dissolved Solids** — Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Uranium** — A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
- **Tetrachloroethylene** — An industrial solvent (PCE) used in dry cleaning and degreasing. A likely human carcinogen; long-term exposure above the federal limit can damage the liver and kidneys.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-06-04 from thewatermap.com._