# North Tahoe Pud - Main — Tahoe Vista, Ca, CA — Drinking Water Quality (2021)

> Contaminant levels for the North Tahoe Pud - Main — Tahoe Vista, Ca, CA public water system from its 2021 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/north-tahoe-pud-main-tahoe-vista-ca/2021
- JSON API: https://www.thewatermap.com/api/water/ca/north-tahoe-pud-main-tahoe-vista-ca/2021
- 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: 2021
- Contaminants measured: 35
- Contaminants with a federal limit: 5
- Contaminants at or above the federal limit: 1
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 0.31–0.81 mg/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | Within the limit |
| HAA5 | Disinfection byproducts | 1.9 mg/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | 0.06 mg/L (MCL) | At or above the limit |
| Perchlorate | Disinfection byproducts | Not detected ug/L (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Chloride | Inorganic chemicals | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Fluoride | Inorganic chemicals | Not detected (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | 2 (MCL) | None detected |
| Nitrate | Inorganic chemicals | Not detected mg/L (Reported level) | Carnelian Woods System #3110023 Groundwater Park Well | 10 mg/L (MCL) | None detected |
| Nitrite | Inorganic chemicals | Not detected mg/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | None detected |
| Sulfate | Inorganic chemicals | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Aluminum | Metals | Not detected ug/L (Reported level) | Carnelian Woods System #3110023 Groundwater Park Well | No federal limit | None detected |
| Barium | Metals | 44.2 ug/L (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | Within the limit |
| Beryllium | Metals | Not detected (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Cadmium | Metals | Not detected (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Calcium | Metals | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Copper | Metals | 75 ug/L (90th percentile) | At the tap | No federal limit | Within the limit |
| Iron | Metals | 2005 ug/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Lead | Metals | Not detected ug/L (90th percentile) | At the tap | No federal limit | None detected |
| Magnesium | Metals | 8.6 mg/L (Reported level) | Carnelian Woods System #3110023 Groundwater Park Well | No federal limit | Detected — no federal limit |
| Manganese | Metals | Not detected mg/L (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Mercury | Metals | Not detected (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | None detected |
| Nickel | Metals | 2014 ug/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Selenium | Metals | Not detected (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Sodium | Metals | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Thallium | Metals | Not detected (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Zinc | Metals | Not detected mg/L (Reported level) | Tahoe Main System System #33110001 Groundwater Park Well | No federal limit | None detected |
| Chromium | Other | Not detected ug/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | None detected |
| Alkalinity | Physical & aggregate | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Bicarbonate | Physical & aggregate | 126 mg/L (Reported level) | Carnelian Woods System #3110023 Groundwater Park Well | No federal limit | Detected — no federal limit |
| Color | Physical & aggregate | 3 (Reported level) | Carnelian Woods System #3110023 Groundwater Park Well | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| pH | Physical & aggregate | 8.2 (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | Detected — no federal limit |
| Total Dissolved Solids | Physical & aggregate | 2014 mg/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |
| Turbidity | Physical & aggregate | 0.102–0.355 NTU (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | No federal limit | Within the limit |
| Combined Radium | Radionuclides | 0 pCi/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | 5 pCi/L (MCL) | None detected |
| Gross Alpha | Radionuclides | 2.32 pCi/L (Reported level) | Tahoe Main System System #33110001 Lake Tahoe Nat'l Ave | 15 pCi/L (MCL) | Within the limit |
| Radon | Radionuclides | 547 pCi/L (Reported level) | Dollar Cove System #3110036 Groundwater Tahoe City PUD | No federal limit | Detected — no federal limit |

## What these contaminants are

- **Chlorine** — A disinfectant added to drinking water to kill bacteria and viruses. Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
- **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.
- **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.
- **Nitrite** — A compound from fertilizer runoff, sewage, and erosion of natural deposits. Like nitrate, elevated levels can cause 'blue baby syndrome' 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.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **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.
- **Magnesium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **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.
- **Mercury** — A toxic metal from erosion of natural deposits and industrial runoff. Long-term exposure above the federal limit can damage the kidneys.
- **Nickel** — A metal from natural deposits and industrial discharge. Long-term exposure can cause skin and other effects; monitored under EPA rules.
- **Selenium** — A trace element from natural deposits and industrial discharge. Essential in tiny amounts, but long-term exposure above the federal limit can cause hair and fingernail loss and circulatory problems.
- **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.
- **Alkalinity** — A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
- **Color** — A measure of visible tint in the water. Regulated only as a secondary (cosmetic) standard.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **pH** — A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
- **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.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Combined Radium** — Combined radium-226 and radium-228 — naturally occurring radioactive elements. Long-term exposure above the federal limit increases the risk of bone cancer.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Radon** — A naturally occurring radioactive gas that can dissolve into groundwater. No enforceable federal limit in drinking water yet; inhalation of released radon raises lung-cancer risk.

## 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._